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A055792
a(n) and floor[a(n)/2] are both squares; i.e. squares which remain squares when written in base 2 and last digit is removed.
+0
3
0, 1, 9, 289, 9801, 332929, 11309769, 384199201, 13051463049, 443365544449, 15061377048201, 511643454094369, 17380816062160329, 590436102659356801, 20057446674355970889, 681362750825443653409, 23146276081390728245001
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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 6 13:15 EST 2009. Contains 170429 sequences.
AT&T Labs Research
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