Puzzles/PrimeTime
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Problem
Provide a J phrase to determine all the times whose display on a 24-hour clock is a prime number.
Constraints
The usual metrics apply: brevity, novelty, velocity and parsimony.
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Solutions
No. Phrase #@;: # 100&(6!:2) (7!:2) Notes Author/Sig 0 1 1j1 1 1#!.':'"1'r<0>2.'8!:2(#~1 p:100#.])(#:,@i.)24 60 26 56 0.000338163 44608 HH':MM -- Dan Bron <<DateTime(2007-11-29T21:13:47Z)>> 1 1 1j1 1 1j1 1 1#!.':'"1'r<0>2.'8!:2(#~1 p:100#.])(#:,@i.)24 60 60 26 65 0.0262146 2625728 HH':MM':SS -- Dan Bron <<DateTime(2007-11-29T21:13:47Z)>> 2 }:"1'q(:)r(0)3.'8!:2(#~1 p:100&#.)>,{i.&.>24 60 23 47 -- B Jonas <<DateTime(2007-12-04T08:28:41Z)>> 3 }:"1'q(:)r(0)3.'8!:2(#~1 p:100&#.)>,{i.&.>24 60 60 23 50 with seconds -- B Jonas <<DateTime(2007-12-04T08:55:26Z)>> 4 ,&.:(':'&,"1)"2]2 2$"1}.@":@>1e4+(#~1&p:)100#.>,{i.&.>24 60 39 59 -- B Jonas <<DateTime(2007-12-04T09:16:01Z)>> 5 ,&.:(':'&,"2)"3":@>10 10#:(#~1 p:100&#.)>,{i.&.>24 60 32 53 -- B Jonas <<DateTime(2007-12-04T09:22:27Z)>> ,.(#~1&p:*.60>100&|)i.2400 16 26 1.8e_4 38848 Just the numbers -- Raul Miller <<DateTime(2007-12-21T22:11:36Z)>>
Notes
1. Changed table header from "Verb" to "Phrase". -- B Jonas <<DateTime(2007-12-04T08:28:41Z)>>