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A031629 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 41. 0
3853, 35050, 35425, 51197, 53021, 71993, 74153, 95089, 96946, 122789, 124193, 126314, 152461, 154025, 157177, 190537, 223313, 228058, 230929, 232853, 266881, 267914, 268949, 269986, 273109, 274154, 275201, 314329, 363245, 368077, 409282 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
MATHEMATICA
cf41Q[n_]:=Module[{s=Sqrt[n], cf, len}, cf=If[IntegerQ[s], {1, 1}, ContinuedFraction[ s][[2]]]; len=Length[cf]; OddQ[len]&&cf[[(len+1)/2]] == 41]; Select[Range[410000], cf41Q] (* Harvey P. Dale, Jun 21 2019 *)
CROSSREFS
Sequence in context: A234918 A015069 A015070 * A220752 A257780 A068267
KEYWORD
nonn
AUTHOR
EXTENSIONS
First term 1682 removed by Georg Fischer, Jun 16 2019
STATUS
approved

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Last modified May 26 08:30 EDT 2024. Contains 372814 sequences. (Running on oeis4.)