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A031519 Numbers n such that continued fraction for sqrt(n) has even period and central term 21. +0
1
443, 451, 459, 463, 467, 479, 487, 491, 499, 503, 511, 523, 527, 1768, 1832, 1856, 1888, 1920, 1952, 2048, 2080, 2112, 3975, 4035, 4119, 4191, 4395, 4479, 4611, 4695, 4755, 7064, 7128, 7256, 7432, 7512, 7576, 7688, 7704, 7768, 7816, 8072, 8152, 8408, 8456 (list; graph; listen)
OFFSET

1,1

CROSSREFS

Sequence in context: A018237 A098256 A105980 this_sequence A031699 A158321 A098254

Adjacent sequences: A031516 A031517 A031518 this_sequence A031520 A031521 A031522

KEYWORD

nonn

AUTHOR

David W. Wilson (davidwwilson(AT)comcast.net)

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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.


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