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A031697 Least term in period of continued fraction for sqrt(n) is 19. 1
363, 1448, 3255, 5784, 9035, 13008, 17703, 23120, 29259, 36120, 43703, 52008, 61035, 70784, 81255, 92448, 104363, 117000, 130359, 137680, 144440, 152920, 159243, 174768, 191015, 207984, 225675, 244088, 263223, 283080, 303659, 314780, 324960 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

(19*m)^2 + 2*m for m >= 1 are terms of this sequence (see comment in A031749). The first term that is not of this form is a(20) = 137680. - Chai Wah Wu, Jun 19 2016

LINKS

Charles R Greathouse IV, Table of n, a(n) for n = 1..10000 (first 60 terms from Vincenzo Librandi)

MATHEMATICA

Select[Range[350000], !IntegerQ[Sqrt[#]] &&Min[ContinuedFraction[Sqrt[#]][[2]]] == 19&](* Vincenzo Librandi, Feb 10 2012 *)

CROSSREFS

Sequence in context: A031517 A192449 A116285 * A158309 A098251 A115464

Adjacent sequences:  A031694 A031695 A031696 * A031698 A031699 A031700

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved

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Last modified November 18 12:16 EST 2019. Contains 329261 sequences. (Running on oeis4.)