References to A102239

a(n) = Sum[5^i, {i, 0, n}] + 1 - Mod[Sum[5^i, {i, 0, n}], 2]
1, 7, 31, 157, 781, 3907, 19531, 97657, 488281, 2441407, 12207031, 61035157

1 seqfan posts

Thu Nov 19 17:19:12 CET 2009    [seqfan] detective work related to Creighton Dement's "Floretions"
Index of A-numbers in seqfan: by ascending order    by month    by frequency    by keyword
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