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Search: id:A128294
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| A128294 |
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a(n) = denominator of b(n): b(1)=1; b(n+1) = b(n) + [b(1);b(2),...,b(n)], where [...] is a continued fraction of rational terms. |
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+0
2
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| 1, 1, 2, 16, 664, 5794064, 33447906751722, 27996871943383371722767277584, 1411648567276084801412872562665108454742185708848843396424
(list; graph; listen)
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OFFSET
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1,3
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COMMENT
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Next term a(10) has roughly 117 digits. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 24 2007
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MAPLE
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L2cfrac := proc(L) local a, i; a := op(-1, L) ; for i from 2 to nops(L) do a := op(-i, L)+1/a ; od: RETURN(a) ; end: A128294 := proc() local b, n, bnxt; b := [1] ; for n from 2 to 10 do bnxt := op(-1, b)+L2cfrac(b) ; b := [op(b), bnxt] ; od: [seq( denom(b[i]), i=1..nops(b))] ; end: A128294() ; - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 24 2007
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CROSSREFS
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Cf. A128293.
Sequence in context: A060279 A012757 A012464 this_sequence A015188 A005118 A108400
Adjacent sequences: A128291 A128292 A128293 this_sequence A128295 A128296 A128297
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KEYWORD
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frac,nonn
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AUTHOR
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Leroy Quet (qq-quet(AT)mindspring.com), Feb 25 2007
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EXTENSIONS
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Corrected and extended by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 24 2007
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