p:@(+/)@(i.!])@>@i. Why is it my favorite? The function does not contain any of the digits 0-9.
----- Original Message ----- From: Kip Murray <[email protected]> Date: Monday, August 17, 2009 12:16 Subject: Re: [Jprogramming] Takes from a mystery sequence To: Programming forum <[email protected]> > Part three: Propose your favorite > > Kip Murray wrote: > > Part two: If you used J to help you figure out the sequence, tell > > > > Kip Murray wrote: > >> Verb i. produces takes from the sequence of non-negative integers: > >> > >> i.20 > >> 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 > >> i.5 > >> 0 1 2 3 4 > >> 5 {. i.20 > >> 0 1 2 3 4 > >> > >> Verb s generates takes from a mystery sequence (no peeking in > Sloane, please) > >> > >> s 13 > >> 2 3 7 19 53 131 311 719 1619 3671 8161 17863 38873 > >> s 5 > >> 2 3 7 19 53 > >> 5 {. s 13 > >> 2 3 7 19 53 > >> > >> Your mission, should you decide to accept it, is to provide a > definition for s . > >> As always, these instructions will ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
