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A020443 Period of continued fraction for sqrt(n) contains exactly seven 1's. 1
115, 135, 247, 464, 611, 744, 767, 1064, 1479, 2079, 2200, 2291, 2360, 2875, 3096, 3283, 3367, 3800, 4187, 4255, 4408, 4672, 4720, 4995, 5151, 5375, 5568, 5611, 5983, 6235, 6431, 6643, 6816, 6840, 6895, 7335, 7367, 7600, 8151, 8208, 8507, 8755, 8843 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Harvey P. Dale, Table of n, a(n) for n = 1..300

MATHEMATICA

pcf7Q[n_]:=Module[{sr=Sqrt[n]}, !IntegerQ[sr]&&Count[ContinuedFraction[ sr][[2]], 1]==7]; Select[Range[9000], pcf7Q] (* Harvey P. Dale, Nov 27 2012 *)

CROSSREFS

Sequence in context: A105993 A036269 A036462 * A129544 A095621 A051975

Adjacent sequences:  A020440 A020441 A020442 * A020444 A020445 A020446

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved

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Last modified February 25 12:00 EST 2021. Contains 341606 sequences. (Running on oeis4.)