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A055997
Numbers n such that n(n-1)/2 is a square.
+0
9
1, 2, 9, 50, 289, 1682, 9801, 57122, 332929, 1940450, 11309769, 65918162, 384199201, 2239277042, 13051463049, 76069501250, 443365544449, 2584123765442, 15061377048201, 87784138523762, 511643454094369
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
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Last modified December 11 12:57 EST 2009. Contains 170656 sequences.
AT&T Labs Research
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