2009-01-15, 11:02 AM
Hmm. For myself, looping from 1 to 2 million takes 53 seconds with this algorithm without jumping. With looping from 5 to 2 million, incrementing by 6 and checking every x and x+2 number, I get 45 seconds. (With LISP, that is) That's over 10% increase in speed, and I'd consider that as a lot.

