a(n) = the smallest factorial such that (the n-th prime)+a(n) is prime, or -1 if no such prime exists..
1, 2, 2, 6, 2, 6, 2, 24, 6, 2, 6, 6, 2, 24, 6, 6, 2, 6, 6, 2, 6, 24, 6, 24, 6, 2, 6, 2, 120, 24
1 seqfan posts
Mon Mar 1 22:22:19 CET 2010 [seqfan] prime + factorial = prime