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A031432 Least term in period of continued fraction for sqrt(n) is 8. 1
17, 66, 147, 260, 405, 582, 791, 1032, 1305, 1610, 1690, 1947, 2316, 2717, 3150, 3615, 4112, 4641, 4778, 5202, 5795, 6420, 7077, 7413, 7766, 8487, 9240, 10025, 10842, 11691, 12572, 13244, 13485, 14430, 14671, 15407, 16416, 16673, 17457 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

16*m^2 + m for m >= 1 are terms of this sequence (see comment in A031742).  The first term that is not of this form is a(11) = 1690. - Chai Wah Wu, Jun 19 2016

LINKS

Charles R Greathouse IV, Table of n, a(n) for n = 1..10000 (first 200 from Vincenzo Librandi)

MATHEMATICA

Select[Range[20000], !IntegerQ[Sqrt[#]] && Min[ContinuedFraction[Sqrt[#]][[2]]] == 8&] (* Vincenzo Librandi, Feb 07 2012 *)

CROSSREFS

Sequence in context: A044536 A115295 A065011 * A157474 A024215 A095071

Adjacent sequences:  A031429 A031430 A031431 * A031433 A031434 A031435

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved

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Last modified June 19 00:37 EDT 2021. Contains 345125 sequences. (Running on oeis4.)