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A048914
Indices of pentagonal numbers which are also 9-gonal.
+0
3
1, 21, 10981, 252081, 132846121, 3049673901, 1607172358861, 36894954600201, 19443571064652241, 446355157703555781, 235228321132990450741, 5400004661002663236321, 2845792209623347408410361
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.
AT&T Labs Research
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