OFFSET
1,3
COMMENTS
Zero for all nonprime n. Note that the +2 dilution of 3 is not the +1 dilution of 5!
EXAMPLE
3 = 11 -> 0101 = 5 -> 001001 = 9, so a(3) = 2; 5 = 101 -> 010001 = 17 -> 001000001 = 65, so a(5) = 2
CROSSREFS
KEYWORD
base,easy,nonn
AUTHOR
Marc LeBrun, Oct 10 2001
STATUS
approved