A game popular among hackers who code in the language APL (see [write-only language] and [line noise]). The objective is to see who can code the most interesting and/or useful routine in one line of operators chosen from APL's exceedingly [hairy] primitive set. A similar amusement was practiced among [TECO] hackers and is now popular among [Perl] aficionados.
Ken Iverson, the inventor of APL, has been credited with a one-liner that, given a number N, produces a list of the prime numbers from 1 to N inclusive. It looks like this:
(2 = 0 +.= T o.| T) / T <- iN
where `o' is the APL null character, the assignment arrow is a single character, and `i' represents the APL iota.
Here's a [Perl] program that prints primes:
perl -wle '(1 x $_) !~ /^(11+)\1+$/ && print while ++ $_'
In the Perl world this game is sometimes called Perl Golf because the player with the fewest (key)strokes wins.
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