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A031431 Least term in period of continued fraction for sqrt(n) is 7. 1
51, 200, 447, 792, 1235, 1776, 2415, 2824, 3152, 3736, 3987, 4920, 5951, 6584, 7080, 8307, 8490, 9632, 9829, 11055, 11266, 11912, 12576, 14195, 15411, 15912, 17727, 18808, 19640, 21651, 22243, 23760, 25967, 27272, 27936, 28272, 30675 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

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

MATHEMATICA

Select[Range[35000], !IntegerQ[Sqrt[#]] && Min[ContinuedFraction[Sqrt[#]][[2]]] == 7&] (* Vincenzo Librandi, Feb 07 2012 *)

CROSSREFS

Sequence in context: A327624 A069762 A245829 * A157365 A157916 A007264

Adjacent sequences:  A031428 A031429 A031430 * A031432 A031433 A031434

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved

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Last modified June 12 12:58 EDT 2021. Contains 344947 sequences. (Running on oeis4.)