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A031617 Numbers n such that continued fraction for sqrt(n) has odd period and central terms 29. 0
5501, 10453, 17770, 18037, 26365, 27017, 36269, 49066, 63793, 76537, 81017, 112754, 114773, 116129, 132394, 133121, 134581, 135314, 136049, 136786, 138266, 139009, 139754, 140501, 154393, 159133, 180617, 185741, 187465, 203461, 204362 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..31.

MATHEMATICA

opct29Q[n_]:=Module[{cf=ContinuedFraction[Sqrt[n]][[2]], len}, len= Length[ cf]; OddQ[len]&&cf[[Floor[len/2]]]==29]; Select[Range[205000], !IntegerQ[Sqrt[#]]&&opct29Q[#]&] (* Harvey P. Dale, Dec 14 2011 *)

CROSSREFS

Sequence in context: A251877 A252312 A247924 * A045132 A096702 A252621

Adjacent sequences:  A031614 A031615 A031616 * A031618 A031619 A031620

KEYWORD

nonn

AUTHOR

David W. Wilson

EXTENSIONS

Corrected by Harvey P. Dale, Dec 14 2011

STATUS

approved

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Last modified February 28 08:12 EST 2021. Contains 341695 sequences. (Running on oeis4.)