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 A206582 The least number s having exactly n twos in the continued fraction of sqrt(s). 4
 3, 2, 19, 45, 71, 153, 199, 589, 301, 989, 526, 1711, 739, 1633, 631, 3886, 1324, 4897, 2524, 7021, 2374, 4189, 2311, 10033, 3571, 3901, 2326, 8869, 4789, 10873, 6301, 10921, 6451, 11929, 6841, 12709, 7996, 13561, 7351, 19177, 9949, 16969, 12286, 22969, 11341 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS MATHEMATICA nn = 50; zeros = nn; t = Table[0, {nn}]; k = 2; While[zeros > 0, If[! IntegerQ[Sqrt[k]], cnt = Count[ContinuedFraction[Sqrt[k]][[2]], 2]; If[cnt <= nn && t[[cnt]] == 0, t[[cnt]] = k; zeros--]]; k++]; Join[{3}, t] CROSSREFS Cf. A206578 (n ones), A206583 (n threes), A206584 (n fours), A206585 (n fives). Sequence in context: A090587 A094554 A223881 * A154262 A154261 A098655 Adjacent sequences: A206579 A206580 A206581 * A206583 A206584 A206585 KEYWORD nonn AUTHOR T. D. Noe, Mar 19 2012 STATUS approved

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Last modified March 30 23:40 EDT 2023. Contains 361623 sequences. (Running on oeis4.)