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A031817 Period of continued fraction for sqrt(n) contains exactly 49 ones. 0
18511, 29467, 38411, 42547, 48427, 54175, 57671, 61359, 65339, 67851, 68951, 73543, 84943, 86104, 93375, 104855, 107231, 109671, 111303, 112184, 114367, 119767, 122627, 125019, 126671, 127000, 130168, 131407, 134392, 139175, 139435, 140107 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..32.

MATHEMATICA

p49Q[n_]:=Module[{sq=Sqrt[n]}, !IntegerQ[sq]&&Count[ ContinuedFraction[ sq][[2]], 1]==49]; Select[Range[150000], p49Q] (* Harvey P. Dale, Aug 29 2012 *)

CROSSREFS

Sequence in context: A247205 A173274 A237012 * A236816 A229076 A157740

Adjacent sequences:  A031814 A031815 A031816 * A031818 A031819 A031820

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved

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Last modified September 20 10:51 EDT 2021. Contains 347584 sequences. (Running on oeis4.)