Nonprimes such that n and phi(n) are relatively prime.
1, 15, 33, 35, 51, 65, 69, 77, 85, 87, 91, 95, 115, 119, 123, 133, 141, 143, 145, 159
1 seqfan posts
Sat Feb 28 00:15:38 CET 2009 [seqfan] Re: An equivalence for integer sequences (with more questions than answers)