A031614 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 26.

170, 1609, 8513, 8698, 20857, 29753, 38641, 49573, 50914, 52273, 61865, 62861, 64877, 77725, 90529, 91733, 93554, 94778, 95393, 96629, 106901, 108209, 108866, 110849, 111514, 112181, 113521, 124633, 128893, 143725, 146765, 149837, 152941

Offset

1,1

Links

Table of n, a(n) for n=1..33.

Mathematica

cf26Q[n_]:=Module[{s=Sqrt[n], cf, len}, If[IntegerQ[s], cf={1, 1}, cf = ContinuedFraction[s][[2]]]; len=Length[cf]; OddQ[len]&&cf[[(len+1)/2]] == 26]; Select[Range[153000], cf26Q] (* Harvey P. Dale, Nov 23 2014 *)

Crossrefs

Sequence in context: A262426 A250965 A250958 * A289648 A187520 A210784

Adjacent sequences: A031611 A031612 A031613 * A031615 A031616 A031617

Keyword

nonn

Author

David W. Wilson

Extensions

Corrected by Harvey P. Dale, Nov 23 2014

Status

approved