(2*2^n+7*(-1)^n)/3.
3, 1, 5, 3, 13, 19, 45, 83, 173, 339, 685, 1363, 2733, 5459, 10925, 21843, 43693
2 seqfan posts
Sun Jun 13 08:51:05 CEST 2010 [seqfan] Re: (3^n+1)/2 is prime, A171381
Sun Jun 13 07:24:58 CEST 2010 [seqfan] (3^n+1)/2 is prime, A171381
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