Generating a picture of lucky numbers to 200,000 loses the striped appearance. Have fun anyway. Remember, lucky numbers and primes are odd. The diagonals of the spiral are odd.
S=:(spiral^:900) >: i.1 1 L =: lucky 100000 LS =: S e. L viewmat LS Dave ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
