I've been doing the Perl Weekly Challenges. This one dealt with date calculations and exhaustive number searches.
I've been doing the Perl Weekly Challenges. This one dealt with expanding braces and calling C functions.
I've been doing the Perl Weekly Challenges. This one dealt with testing file contents and producing the current time.
I've been doing the Perl Weekly Challenges. This one dealt with finding the intersection of two lines and doing worrying things to innocent variables.
I've been doing the Perl Weekly Challenges. This one dealt with finding letters in words and the mean of circular quantities.
I've been doing the Perl Weekly Challenges. This one dealt with building long strings and the Chaocypher.
I've been doing the Perl Weekly Challenges. This one dealt with minimal programs and inverted-index text search.
I've been doing the Perl Weekly Challenges. This one dealt with difference series and prime factorisation.
I've been doing the Perl Weekly Challenges. This one dealt with sexy primes and LZW encoding.
I've been doing the Perl Weekly Challenges. This one dealt with e, and URLs again.
I've been doing the Perl Weekly Challenges. This one dealt with string splitting and amicable numbers.
I've been doing the Perl Weekly Challenges. This one dealt with months and word-wrapping.
I've been doing the Perl Weekly Challenges. This one was a couple of standard computer-science problems.
I've been doing the Perl Weekly Challenges. This one was to implement the Ackermann function and parse URLs.
I've been doing the Perl Weekly Challenges. This one was to do a fiddly numerical calculation, and to check Bitcoin addresses.
I've recently started doing the Perl Weekly Challenges. This one was to hunt primes and do "Vigenère" enciphering.