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A031795 Period of continued fraction for sqrt(n) contains exactly 27 ones. 1
5539, 7099, 11227, 11651, 12367, 15007, 15343, 17763, 18091, 19027, 24287, 24779, 24895, 28408, 28792, 32248, 35375, 39183, 39783, 40255, 40888, 42355, 44239, 44951, 45123, 45171, 45671, 46096, 46779, 49864, 50803, 50944, 51895, 52235, 52599, 53215 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Are there any prime numbers in this sequence? - Zak Seidov, Feb 18 2012

LINKS

Zak Seidov, Table of n, a(n) for n = 1..1000

MATHEMATICA

cf27Q[n_]:=Module[{sqrtn=Sqrt[n]}, !IntegerQ[sqrtn]&&Count[ ContinuedFraction[ sqrtn][[2]], 1]==27]; Select[Range[55000], cf27Q] (* Harvey P. Dale, Feb 18 2012 *)

CROSSREFS

Sequence in context: A164079 A278012 A255100 * A180267 A203336 A045104

Adjacent sequences:  A031792 A031793 A031794 * A031796 A031797 A031798

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved

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Last modified November 23 09:38 EST 2017. Contains 295115 sequences.