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A031600
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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.
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0
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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
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OFFSET
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1,1
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LINKS
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Table of n, a(n) for n=1..36.
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EXAMPLE
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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.
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CROSSREFS
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Sequence in context: A337960 A331346 A164771 * A251272 A030083 A184203
Adjacent sequences: A031597 A031598 A031599 * A031601 A031602 A031603
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KEYWORD
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nonn
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AUTHOR
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David W. Wilson
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EXTENSIONS
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First term 145 removed by Georg Fischer, Jun 15 2019
Definition clarified by N. J. A. Sloane, Aug 18 2021
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STATUS
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approved
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