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 A031600 Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 12. 0
 1049, 3217, 3445, 5021, 6569, 8506, 8689, 11314, 11738, 11953, 14285, 16825, 17341, 18397, 20129, 20693, 21554, 22138, 22433, 22826, 23729, 24034, 24341, 24961, 25274, 25589, 26546, 29629, 30313, 31817, 33965, 35437, 35930, 36682, 37061, 38210 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Table of n, a(n) for n=1..36. EXAMPLE CF(sqrt(145)) = (12, (24)), therefore 145 is not in the sequence. CF(sqrt(1049)) = (32, (2,1,1,2,1,4,3,1,5,7,1,12, 12,1,7,5,1,3,4,1,2,1,1,2, 64)), therefore 1049 is in the sequence. CROSSREFS Sequence in context: A337960 A331346 A164771 * A251272 A030083 A184203 Adjacent sequences: A031597 A031598 A031599 * A031601 A031602 A031603 KEYWORD nonn AUTHOR David W. Wilson EXTENSIONS First term 145 removed by Georg Fischer, Jun 15 2019 Definition clarified by N. J. A. Sloane, Aug 18 2021 STATUS approved

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Last modified July 13 11:56 EDT 2024. Contains 374282 sequences. (Running on oeis4.)