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A124174
Sophie Germain triangular numbers tr: 2*tr+1 is also a triangular number.
+0
1
0, 1, 10, 45, 351, 1540, 11935, 52326, 405450, 1777555, 13773376, 60384555, 467889345, 2051297326, 15894464365, 69683724540, 539943899076, 2367195337045, 18342198104230, 80414957735001, 623094791644755
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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 20 13:54 EST 2009. Contains 171081 sequences.
AT&T Labs Research
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