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A031519 that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 21. 0
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; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..45.

CROSSREFS

Sequence in context: A225350 A171392 A105980 * A031699 A158321 A293978

Adjacent sequences:  A031516 A031517 A031518 * A031520 A031521 A031522

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved

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Last modified May 19 18:35 EDT 2022. Contains 353847 sequences. (Running on oeis4.)