## 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.

 Spoiler Alert! http://imgs.xkcd.com/comics/factoring_the_time.png xkcd.com

## 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 -- DanBron 2007-11-29 21:13:47 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 -- DanBron 2007-11-29 21:13:47 2 }:"1'q(:)r(0)3.'8!:2(#~1 p:100&#.)>,{i.&.>24 60 23 47 -- BJonas 2007-12-04 08:28:41 3 }:"1'q(:)r(0)3.'8!:2(#~1 p:100&#.)>,{i.&.>24 60 60 23 50 with seconds -- BJonas 2007-12-04 08:55:26 4 ,&.:(':'&,"1)"2]2 2\$"1}.@":@>1e4+(#~1&p:)100#.>,{i.&.>24 60 39 59 -- BJonas 2007-12-04 09:16:01 5 ,&.:(':'&,"2)"3":@>10 10#:(#~1 p:100&#.)>,{i.&.>24 60 32 53 -- BJonas 2007-12-04 09:22:27 ,.(#~1&p:*.60>100&|)i.2400 16 26 1.8e_4 38848 Just the numbers -- Raul Miller 2007-12-21 22:11:36

## Notes

1. Changed table header from "Verb" to "Phrase". -- BJonas 2007-12-04 08:28:41

Puzzles/PrimeTime (last edited 2008-12-08 10:45:29 by anonymous)