A031664 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 76.

119797, 176521, 250169, 327409, 420193, 422789, 425393, 426698, 530345, 533261, 643645, 653305, 766154, 774929, 780218, 783754, 905026, 906929, 910741, 914561, 918389, 920306, 926069, 1061629, 1219657, 1224077, 1232941, 1241837

Offset

1,1

Links

Table of n, a(n) for n=1..28.

Crossrefs

Subsequence of A003814.

Sequence in context: A257381 A257267 A175581 * A234736 A236094 A043622

Adjacent sequences: A031661 A031662 A031663 * A031665 A031666 A031667

Keyword

nonn

Author

David W. Wilson

Extensions

First term 5777 removed by Georg Fischer, Jun 16 2019

Status

approved