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A129556
Numbers n such that centered pentagonal number
A005891
(n) = (5n^2+5n+2)/2 is a perfect square.
+0
5
0, 2, 21, 95, 816, 3626, 31005, 137711, 1177392, 5229410, 44709909, 198579887, 1697799168, 7540806314, 64471658493, 286352060063, 2448225223584, 10873837476098, 92968086837717, 412919472031679, 3530339074609680
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Maintained by
N. J. A. Sloane
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Last modified November 30 13:13 EST 2009. Contains 167758 sequences.
AT&T Labs Research
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