A quirkiness of J is that ": is faster than 10&#. inv. Especially with larger extended numbers.
----- Original Message ----- From: Kip Murray <[email protected]> To: "[email protected]" <[email protected]> Cc: Sent: Thursday, October 15, 2015 5:03 PM Subject: [Jprogramming] Finding prime palindromes My solution is forwarded below. Try find i. 40 --Kip Murray ---------- Forwarded message --------- From: km <[email protected]> Date: Thu, Oct 15, 2015 at 3:51 PM Subject: Finding prime palindromes To: Kip Murray <[email protected]> Here's my solution. --Kip Murray test =: ( [: (-: |.) 10&#.^:_1 )"0 find =: [: (test # ]) p: NB. find prime palindromes Sent from my iPad ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
