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A046193
Indices of heptagonal numbers (
A000566
) which are also triangular.
+0
3
1, 5, 221, 1513, 71065, 487085, 22882613, 156839761, 7368130225, 50501915861, 2372515049741, 16261460067385, 763942477886281, 5236139639782013, 245987105364332645, 1686020702549740705, 79207083984837225313
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
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Last modified November 25 08:46 EST 2009. Contains 167481 sequences.
AT&T Labs Research
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