A031607 - OEIS

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A031607

Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 19.

4538, 4673, 7477, 7825, 11785, 16553, 22129, 22426, 26533, 26858, 27514, 28513, 34217, 40441, 43705, 48053, 50258, 52058, 57269, 57746, 58706, 59674, 60161, 61141, 62129, 62626, 68329, 72553, 77017, 78125, 79241, 80365, 81497, 83785, 88577, 90362

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OFFSET

1,1

LINKS

Table of n, a(n) for n=1..36.

CROSSREFS

Subsequence of A003814.

Sequence in context: A234171 A262848 A307919 * A193311 A020432 A186471

Adjacent sequences: A031604 A031605 A031606 * A031608 A031609 A031610

KEYWORD

nonn

AUTHOR

David W. Wilson

EXTENSIONS

First term 362 removed by Georg Fischer, Jun 16 2019

STATUS

approved