RogerBW's Blog

The Weekly Challenge 184: Split Sequence 29 September 2022

I’ve been doing the Weekly Challenges. The latest involved modifying and picking things out of sequences. (Note that this is open until 2 October 2022.)

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The Weekly Challenge 183: A Unique Date 20 September 2022

I’ve been doing the Weekly Challenges. The latest involved array comparisons and date calculations. (Note that this is open until 25 September 2022.)

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The Weekly Challenge 182: Max is Common 14 September 2022 - 2 comments

I’ve been doing the Weekly Challenges. The latest involved list searching and finding a common subpath. (Note that this is open until 18 September 2022.)

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The Weekly Challenge 181: Hot Sentence 08 September 2022

I’ve been doing the Weekly Challenges. The latest involved string splitting and data sorting. (Note that this is open until 11 September 2022.)

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The Weekly Challenge 180: Unique Trim 30 August 2022 - 4 comments

I’ve been doing the Weekly Challenges. The latest involved filtering strings and lists. (Note that this is open until 4 September 2022.)

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The Weekly Challenge 179: Spark and Spell 25 August 2022

I’ve been doing the Weekly Challenges. The latest involved ordinal numbers and Unicode generation. (Note that this is open until 28 August 2022.)

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The Weekly Challenge 178: Imaginary Date 18 August 2022

I’ve been doing the Weekly Challenges. The latest involved an unusual base representation and date calculations. (Note that this is open until 21 August 2022.)

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The Weekly Challenge 177: Damm Cyclops 11 August 2022

I’ve been doing the Weekly Challenges. The latest involved a check-digit function and more number reversals. (Note that this is open until 14 August 2022.)

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The Weekly Challenge 176: Reversible Permutations 04 August 2022

I’ve been doing the Weekly Challenges. The latest involved lots of number-string conversions. (Note that this is open until 7 August 2022.)

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The Weekly Challenge 175: Perfect Sunday 26 July 2022

I’ve been doing the Weekly Challenges. The latest involved date calculations and number theory. (Note that this is open until 31 July 2022.)

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The Weekly Challenge 174: The Rank Smell of Disarium 20 July 2022

I’ve been doing the Weekly Challenges. The latest involved disarium numbers and ranked permutations. (Note that this is open until 24 July 2022.)

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The Weekly Challenge 173: The Aesthetics of Sylvester 14 July 2022

I’ve been doing the Weekly Challenges. The latest involved more mathematical tests. (Note that this is open until 17 July 2022.)

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The Weekly Challenge 172: Partition of Five 07 July 2022

I’ve been doing the Weekly Challenges. The latest involved prime partitioning and some basic statistics. (Note that this is open until 10 July 2022.)

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The Weekly Challenge 171: First-Class Abundance 30 June 2022

I’ve been doing the Weekly Challenges. The latest involved findind odd abundant numbers and first-class functions. (Note that this is open until 3 July 2022.)

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The Weekly Challenge 170: Kronecker's Primorial 23 June 2022

I’ve been doing the Weekly Challenges. The latest involved primes and an unusual form of matrix multiplication. (Note that this is open until 26 June 2022.)

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The Weekly Challenge 169: The Brilliance of Achilles 15 June 2022

I’ve been doing the Weekly Challenges. The latest involved more numerical series. (Note that this is open until 19 June 2022.)

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The Weekly Challenge 168: At Home with the Perrins 09 June 2022

I’ve been doing the Weekly Challenges. The latest involved more furkling about with prime numbers. (Note that this is open until 12 June 2022.)

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The Weekly Challenge 167: Circling the Gamma 02 June 2022

I’ve been doing the Weekly Challenges. The latest involved circular primes and the Lanczos approximation. (Note that this is open until 5 June 2022.)

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The Weekly Challenge 166: Hexing the Directories 26 May 2022

I’ve been doing the Weekly Challenges. The latest involved word searching and directory mangling. (Note that this is open until 29 May 2022.)

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The Weekly Challenge 165: Scaling the Fits 19 May 2022

I’ve been doing the Weekly Challenges. The latest involved generating SVG and fitting lines to points. (Note that this is open until 22 May 2022.)

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PostScript Libraries 15 May 2022

Yes, I'm still programming in PostScript. Why? Because I enjoy it.

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The Weekly Challenge 164: Happy Palindromes 12 May 2022

I’ve been doing the Weekly Challenges. The latest involved two number-sequence tasks. (Note that this is open until 15 May 2022.)

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The Weekly Challenge 163: Sums and Sums 05 May 2022

I’ve been doing the Weekly Challenges. The latest involved various summation-like operations. (Note that this is open until 8 May 2022.)

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The Weekly Challenge 162: Playing Fair with ISBNs 28 April 2022

I’ve been doing the Weekly Challenges. The latest involved ISBN check digits and the Wheatstone-Playfair cipher. (Note that this is open until 1 May 2022.)

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The Weekly Challenge 161: Words and More Words 21 April 2022

I’ve been doing the Weekly Challenges. The latest involved word selections and manipulations. (Note that this is open until 24 April 2022.)

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The Weekly Challenge 160: Balancing Four is Magic 14 April 2022

I’ve been doing the Weekly Challenges. The latest involved English word lengths and array partitioning. (Note that this is open until 17 April 2022.)

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The Weekly Challenge 159: Farey and Moebius 07 April 2022

I’ve been doing the Weekly Challenges. The latest involved generating more sequences. (Note that this is open until 10 April 2022.)

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The Weekly Challenge 158: Prime Cuban Additives 31 March 2022

I’ve been doing the Weekly Challenges. The latest involved subsets of primes. (Note that this is open until 3 April 2022.)

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The Weekly Challenge 157: Pythagoras in Brazil 24 March 2022

I’ve been doing the Weekly Challenges. The latest involved a variety of means and more number theory. (Note that this is open until 27 March 2022.)

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The Weekly Challenge 156: Weirdly Pernicious or Perniciously Weird? 17 March 2022

I’ve been doing the Weekly Challenges. The latest involved more number-theory definitions. (Note that this is open until 20 March 2022.)

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The Weekly Challenge 155: Pisano's Fortune 10 March 2022

I’ve been doing the Weekly Challenges. The latest involved more number theory problems. (Note that this is open until 13 March 2022.)

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The Weekly Challenge 154: Missing Padovan 03 March 2022

I’ve been doing the Weekly Challenges. The latest involved permutations and primality testing. (Note that this is open until 6 March 2022.)

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The Weekly Challenge 153: Factoriality 24 February 2022

I’ve been doing the Weekly Challenges. The latest involved various progressions based on factorials. (Note that this is open until 27 February 2022.)

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The Weekly Challenge 152: Triangles, Rectangles, and Objects 17 February 2022

I’ve been doing the Weekly Challenges. The latest involved finding minimum paths and overlapping rectangles. (Note that this is open until 20 February 2022.)

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The Weekly Challenge 151: Robbing Depth 10 February 2022

I’ve been doing the Weekly Challenges. The latest involved a return to binary trees and an optimisation puzzle. (Note that this is open until 13 February 2022.)

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The Weekly Challenge 150: Square-Free Words 03 February 2022

I’ve been doing the Weekly Challenges. The latest involved a Fibonacci-like word construction and a search for square-free numbers. (Note that this is open until 6 February 2022.)

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Quicksort in Postscript 30 January 2022 - 5 comments

I think this is the closest I've come to writing a Cthulhu Mythos document: if you don't know what's going on, it's harmless, but with a little knowledge it can be mildly disturbing…

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The Weekly Challenge 149: Fibonacci Squares 27 January 2022

I’ve been doing the Weekly Challenges. The latest involved just-in-time Fibonacci and squares without repeating digits. (Note that this is open until 30 January 2022.)

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The Weekly Challenge 148: Eban, Cardano 20 January 2022 - 2 comments

I’ve been doing the Weekly Challenges. The latest involved various sorts of numerical search. (Note that this is open until 23 January 2022.)

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The Weekly Challenge 147: Truncating the Pentagon 11 January 2022

I’ve been doing the Weekly Challenges. The latest involved prime searches and pentagonal numbers. (Note that this is open until 16 January 2022.)

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The Weekly Challenge 146: Curious Prime 04 January 2022

I’ve been doing the Weekly Challenges. The latest involved prime-counting and fraction trees. (Note that this is open until 9 January 2022.)

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The Weekly Challenge 145: Tree Product 28 December 2021

I’ve been doing the Weekly Challenges. The latest involved vector multiplication and a recently-invented data structure. (Note that this is open until 2 January 2022.)

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The Weekly Challenge 144: Semiprime Ulam 21 December 2021

I’ve been doing the Weekly Challenges. The latest involved some interesting mathematical sequences. (Note that this is open until 26 December 2021.)

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The Weekly Challenge 143: Stealthy Calculator 15 December 2021

I’ve been doing the Weekly Challenges. The latest involved counting divisors and another joke sort. (Note that this is open until 19 December 2021.)

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The Weekly Challenge 142: The Last Digit of Sleep 07 December 2021

I’ve been doing the Weekly Challenges. The latest involved counting divisors and another joke sort. (Note that this is open until 12 December 2021.)

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The Weekly Challenge 141: Binary and Tabular 30 November 2021

I’ve been doing the Weekly Challenges. The latest involved an unusual binary encoding and indexing into a multiplication table. (Note that this is open until 5 December 2021.)

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Perl Weekly Challenge 140: Binary and Tabular 24 November 2021

I’ve been doing the Weekly Challenges. The latest involved an unusual binary encoding and indexing into a multiplication table. (Note that this is open until 28 November 2021.)

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Perl Weekly Challenge 139: Jort Primes 18 November 2021

I’ve been doing the Weekly Challenges. The latest involved date calculations and numerical decompositions. (Note that this is open until 21 November 2021.)

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Perl Weekly Challenge 138: Split Work 12 November 2021

I’ve been doing the Weekly Challenges. The latest involved date calculations and numerical decompositions. (Note that this is open until 14 November 2021.)

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Perl Weekly Challenge 137: Long Cheryl 05 November 2021

I’ve been doing the Weekly Challenges. The latest involved date calculations and numeric palindromes. (Note that this is open until 7 November 2021.)

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Perl Weekly Challenge 136: Fibonacci Friends 29 October 2021

I’ve been doing the Weekly Challenges. The latest involved GCDs, powers of two, and an unusual numeric sequence. (Note that this is open until 31 October 2021.)

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Perl Weekly Challenge 135: Valid Middle 21 October 2021

I’ve been doing the Weekly Challenges. The latest involved digit substrings and securities validation. (Note that this is open until 24 October 2021.)

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Perl Weekly Challenge 134: Pandigital Multiplication 13 October 2021

I’ve been doing the Weekly Challenges. The latest involved pandigital numbers and multiplication tables. (Note that this is open until 17 October 2021.)

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Perl Weekly Challenge 133: Rooting the Smith 06 October 2021

I’ve been doing the Weekly Challenges. The latest involved Smith numbers and square roots. (Note that this is open until 10 October 2021.)

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Perl Weekly Challenge 132: Hash on the Mirror 02 October 2021

I’ve been doing the Weekly Challenges. The latest involved date calculations and inner joins. (Note that this is open until 3 October 2021.)

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Perl Weekly Challenge 131: Splitting and Splitting More 23 September 2021

I’ve been doing the Weekly Challenges. The latest involved splitting arrays and strings. (Note that this is open until 26 September 2021.)

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Perl Weekly Challenge 130: An Odd Tree 17 September 2021

I’ve been doing the Weekly Challenges. The latest involved more binary trees and linked lists. (Note that this is open until 19 September 2021.)

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Perl Weekly Challenge 129: Eats Roots and Lists 10 September 2021

I’ve been doing the Weekly Challenges. The latest involved more binary trees and linked lists. (Note that this is open until 12 September 2021.)

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Perl Weekly Challenge 127: Disjoint Conflict 26 August 2021

I’ve been doing the Weekly Challenges. The latest involved set intersections and merging intervals. (Note that this is open until 29 August 2021.)

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Perl Weekly Challenge 125: Pythagorean Diameter 11 August 2021 - 1 comment

I’ve been doing the Weekly Challenges. The latest involved Pythagorean triples and binary trees. (Note that this is open until 15 August 2021.)

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Perl Weekly Challenge 124: War Day 04 August 2021 - 4 comments

I’ve been doing the Weekly Challenges. The latest involved ASCII graphics and set partitioning. (Note that this is open until 8 August 2021.)

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Perl Weekly Challenge 123: Ugly Square 28 July 2021 - 3 comments

I’ve been doing the Weekly Challenges. The latest involved regular numbers and geometrical squareness testing. (Note that this is open until 1 August 2021.)

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Perl Weekly Challenge 122: Basketball Stream 22 July 2021 - 1 comment

I’ve been doing the Weekly Challenges. The latest involved a progressive average and additive compositions. (Note that this is open until 25 July 2021.)

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Perl Weekly Challenge 121: Travelling Bit 14 July 2021 - 6 comments

I’ve been doing the Weekly Challenges. The latest involved more binary manipulation and a traditional problem. (Note that this is open until 18 July 2021.)

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Perl Weekly Challenge 120: Swap Clock 07 July 2021 - 1 comment

I’ve been doing the Perl Weekly Challenges. The latest involved more binary manipulation and analogue clocks. (Note that this is open until 11 July 2021.)

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