Zero together with the nonprime numbers A018252.
0, 1, 4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 22, 24, 25, 26, 27, 28, 30, 32, 33, 34, 35
1 seqfan posts
Sat Jan 8 15:33:35 CET 2011 [seqfan] Re: The function of status "prime-noprime" of n: 2^A082495-1^062173(n).