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A128385
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a(n) = denominator of r(n): r(n) is such that the continued fraction (of rational terms) [r(1);r(2),...,r(n)] = b(n) for every positive integer n, where b(1) = 1 and b(n+1) = 1 + 1/b(n)^2 for.every positive integer n.
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1
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OFFSET
| 1,3
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COMMENTS
| b(n) = A076725(n)/A076725(n-1)^2. The limit, as n -> infinity, of r(n)*r(n+1) = (2 /x^3) + (x^3 /2) - 2, where x is the real root of x^3 -x^2 -1 = 0. (This limit result needs some checking.)
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EXAMPLE
| {r(n)}: 1, 1, 1/3, 9/13, 91/289,...
b(4) = 41/25 = 1 + 1/(1 + 1/(1/3 + 13/9)).
And b(5) = 2306/1681 = 1 + 1/(1 + 1/(1/3 + 1/(9/13 + 289/91))).
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CROSSREFS
| Cf. A128384, A076725.
Sequence in context: A006487 A042823 A132560 * A100524 A000859 A045748
Adjacent sequences: A128382 A128383 A128384 * A128386 A128387 A128388
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KEYWORD
| frac,more,nonn
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AUTHOR
| Leroy Quet Feb 28 2007
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