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A031813 Period of continued fraction for sqrt(n) contains exactly 45 ones. 0
20875, 25559, 25591, 32875, 39447, 50879, 51847, 57955, 62419, 70599, 70871, 75947, 77087, 78055, 82711, 84639, 86995, 95839, 96472, 98059, 98651, 100951, 103000, 105419, 105671, 107271, 108824, 112144, 117107, 119755, 123163, 126355, 128547 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

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

MATHEMATICA

cf45Q[n_]:=Module[{c=Sqrt[n]}, !IntegerQ[c]&&Count[ContinuedFraction[ c] [[2]], 1]==45]; Select[Range[150000], cf45Q] (* Harvey P. Dale, Dec 24 2012 *)

CROSSREFS

Sequence in context: A235952 A207794 A256840 * A043654 A188104 A278903

Adjacent sequences:  A031810 A031811 A031812 * A031814 A031815 A031816

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved

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Last modified January 18 20:19 EST 2018. Contains 297865 sequences.