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A031842 Period of continued fraction for sqrt(n) contains exactly 74 ones. 0
6484, 6679, 9349, 9556, 9601, 9781, 9961, 10711, 11341, 11686, 12853, 14939, 15391, 15913, 16063, 16561, 16804, 17419, 17809, 18127, 18427, 18489, 18628, 19273, 19681, 20143, 20653, 21011, 21989, 22027, 23143, 23299, 23509, 23731, 23812, 23887, 24613 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..37.

MATHEMATICA

cf74Q[n_]:=Module[{s=Sqrt[n], t}, t=If[IntegerQ[s], 1, Count[ ContinuedFraction[ s][[2]], 1]]; t==74]; Select[Range[25000], cf74Q] (* Harvey P. Dale, May 26 2015 *)

CROSSREFS

Sequence in context: A104343 A207837 A104242 * A028544 A237245 A049529

Adjacent sequences: A031839 A031840 A031841 * A031843 A031844 A031845

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved

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Last modified January 28 08:29 EST 2023. Contains 359850 sequences. (Running on oeis4.)