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 A013650 Period of continued fraction for sqrt(n) contains exactly three 1's. 1
 7, 32, 75, 88, 136, 215, 279, 280, 312, 403, 427, 560, 711, 736, 851, 880, 923, 1007, 1067, 1272, 1311, 1363, 1431, 1495, 1736, 1855, 1887, 1955, 1976, 1995, 2128, 2159, 2184, 2272, 2511, 2567, 2640, 2728, 2880, 3055, 3211, 3560, 3751, 3811, 3927, 3984 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 REFERENCES Kenneth H. Rosen, Elementary Number Theory and Its Applications, Addison-Wesley, 1984, p. 426 (but beware of errors!). LINKS MATHEMATICA Select[ Range@ 1900, !IntegerQ[ Sqrt@ #] && Count[ ContinuedFraction[ Sqrt@ #][[2]], 1] == 3 &] (* Robert G. Wilson v, Jul 03 2011 *) CROSSREFS Sequence in context: A153716 A153715 A060123 * A013656 A067982 A126562 Adjacent sequences:  A013647 A013648 A013649 * A013651 A013652 A013653 KEYWORD nonn AUTHOR STATUS approved

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Last modified August 3 08:10 EDT 2020. Contains 336197 sequences. (Running on oeis4.)