Indices of semiprime (A001358) values of Heptanacci-Lucas numbers A104621.
4, 8, 9, 11, 12, 14, 15, 16, 22, 23, 32, 34, 37, 41, 42, 50, 52, 57, 58, 66, 69, 76, 77, 81
1 seqfan posts
Sun Sep 5 22:33:55 CEST 2010 [seqfan] Re: phi-antipalindormic numbers