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 A195531 Hypotenuses of Pythagorean triples in A195499 and A195503. 3
 5, 17, 65, 241, 901, 3361, 12545, 46817, 174725, 652081, 2433601, 9082321, 33895685, 126500417, 472105985, 1761923521, 6575588101, 24540428881, 91586127425, 341804080817, 1275630195845, 4760716702561, 17767236614401, 66308229755041 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS See A195500 for discussion and list of related sequences; see A195499 for Mathematica program. Essentially the same as A120893. - R. J. Mathar, Sep 21 2011 LINKS Table of n, a(n) for n=1..24. FORMULA Conjecture: a(n) = 3*a(n-1)+3*a(n-2)-a(n-3). G.f.: x*(5+2*x-x^2)/((1+x)*(1-4*x+x^2)). [Colin Barker, Apr 08 2012] CROSSREFS Cf. A195500, A195499, A195503. Sequence in context: A273793 A196926 A120893 * A273535 A149672 A149673 Adjacent sequences: A195528 A195529 A195530 * A195532 A195533 A195534 KEYWORD nonn AUTHOR Clark Kimberling, Sep 20 2011 STATUS approved

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Last modified June 17 15:15 EDT 2024. Contains 373449 sequences. (Running on oeis4.)