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Apr 8, 2014 at 19:36 comment added algorithmshark @Taemyr (*@{.=*./)@(+.}.@i.) for 20 char. +. is GCD, *. is LCM, * is Signum. But until the specs change, the 7 char solution is the shortest valid solution.
Apr 8, 2014 at 8:27 comment added Taemyr I feel that using a built in primality tester goes against the spirit of the challenge.
Apr 8, 2014 at 0:06 history answered algorithmshark CC BY-SA 3.0