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A046172
Indices of pentagonal numbers which are also square.
+0
6
1, 81, 7921, 776161, 76055841, 7452696241, 730288175761, 71560788528321, 7012226987599681, 687126683996240401, 67331402804643959601, 6597790348171111800481, 646516122717964312487521
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Maintained by
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Last modified December 17 13:29 EST 2009. Contains 170826 sequences.
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