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A020420 Numbers k such that the continued fraction for sqrt(k) has period 81. 0
3169, 3697, 5233, 6269, 6521, 9521, 9754, 9946, 10169, 12149, 12202, 12385, 13738, 15461, 15706, 15898, 17321, 18922, 19853, 20065, 20341, 21977, 21985, 23333, 24154, 24457, 24953, 25013, 25034, 25181, 27109, 27781, 27802, 28114, 28249, 28786, 28873 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..37.

CROSSREFS

Sequence in context: A140350 A309024 A217247 * A155484 A345599 A345858

Adjacent sequences:  A020417 A020418 A020419 * A020421 A020422 A020423

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved

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Last modified July 2 01:56 EDT 2022. Contains 354984 sequences. (Running on oeis4.)