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 A031748 Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 70. 1
 1226, 4902, 11028, 19604, 30630, 44106, 60032, 78408, 99234, 122510, 148236, 176412, 207038, 240114, 275640, 313616, 354042, 396918, 442244, 490020, 540246, 592922, 648048, 705624, 765650, 828126, 893052, 960428, 1030254, 1102530 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS a(n) = 1225n^2 + n for n < 73, but a(73) = 6355512. - Charles R Greathouse IV, Aug 04 2017 LINKS Charles R Greathouse IV, Table of n, a(n) for n = 1..10000 MATHEMATICA ltcf70Q[n_]:=Module[{s=Sqrt[n]}, If[IntegerQ[s], 1, Min[ ContinuedFraction[ s] [[2]]]]==70]; Select[Range[1200000], ltcf70Q] (* Harvey P. Dale, Jun 14 2015 *) CROSSREFS Sequence in context: A151657 A218273 A046177 * A031658 A031533 A031713 Adjacent sequences: A031745 A031746 A031747 * A031749 A031750 A031751 KEYWORD nonn AUTHOR David W. Wilson STATUS approved

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Last modified June 9 18:23 EDT 2023. Contains 363183 sequences. (Running on oeis4.)