A031727 - OEIS

A031727

Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 49.

2403, 9608, 21615, 38424, 60035, 86448, 117663, 153680, 194499, 240120, 290543, 345768, 405795, 470624, 540255, 614688, 693923, 777960, 866799, 960440, 1058883, 1162128, 1270175, 1383024, 1500675, 1623128, 1750383, 1882440, 2019299, 2160960

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OFFSET

1,1

LINKS

Charles R Greathouse IV, Table of n, a(n) for n = 1..10000

MATHEMATICA

cf49Q[n_]:=Module[{s=Sqrt[n]}, If[IntegerQ[s], 1, Min[ContinuedFraction[s][[2]]]==49]]; Select[Range[217*10^4], cf49Q] (* Harvey P. Dale, Jul 17 2019 *)

CROSSREFS

Sequence in context: A031776 A251774 A031547 * A236038 A323271 A283783

Adjacent sequences: A031724 A031725 A031726 * A031728 A031729 A031730

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved