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A031818 Period of continued fraction for sqrt(n) contains exactly 50 ones. 0
3004, 3676, 3691, 4414, 5377, 5413, 5509, 5524, 5692, 5721, 5758, 6009, 6091, 6349, 6541, 6781, 6796, 6871, 6961, 7009, 7041, 7149, 7321, 7609, 7729, 7732, 7996, 8179, 8529, 8617, 8881, 8902, 8929, 8969, 9013, 9172, 9249, 9397, 9589, 9706, 9733, 9851 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..42.

MATHEMATICA

upto=10000; With[{t=Complement[Range[upto], Range[Floor[Sqrt[ upto]]]^2]}, Select[t, Count[ContinuedFraction[Sqrt[#]][[2]], 1]==50&]] (* Harvey P. Dale, Dec 02 2011 *)

CROSSREFS

Sequence in context: A140915 A140928 A090162 * A152207 A279584 A004228

Adjacent sequences:  A031815 A031816 A031817 * A031819 A031820 A031821

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved

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Last modified September 20 12:05 EDT 2021. Contains 347586 sequences. (Running on oeis4.)