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A048908
Indices of triangular numbers which are also 9-gonal.
+0
3
1, 25, 406, 6478, 103249, 1645513, 26224966, 417953950, 6661038241, 106158657913, 1691877488374, 26963881156078, 429730221008881, 6848719654986025, 109149784258767526, 1739547828485294398
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Maintained by
N. J. A. Sloane
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njas@research.att.com
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Last modified December 5 20:25 EST 2009. Contains 170428 sequences.
AT&T Labs Research
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