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Search: id:A119811
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| A119811 |
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Numerators of the convergents to the continued fraction for the constant A119809 defined by binary sums involving Beatty sequences: c = Sum_{n>=1} 1/2^A049472(n) = Sum_{n>=1} A001951(n)/2^n. |
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3
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| 2, 7, 72, 9511, 1246930216, 2742028548141904733479, 1737967067447512977484869808775151193351704374584616
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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The number of digits in these numerators are (beginning at n=1): [1,1,2,4,10,22,52,124,297,717,1729,4173,10074,24319,58709,141735,..].
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EXAMPLE
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c = 2.32258852258806773012144068278798408011950250800432925665718...
Convergents begin:
[2/1, 7/3, 72/31, 9511/4095, 1246930216/536870911,...]
where the denominators of the convergents equal [2^A000129(n-1)-1]:
[1,3,31,4095,536870911,1180591620717411303423,...],
and A000129 is the Pell numbers.
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PROGRAM
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(PARI) {a(n)=local(M=contfracpnqn(vector(n, k, if(k==1, 2, 2^round(((1+sqrt(2))^(k-1)+(1-sqrt(2))^(k-1))/2) +2^round(((1+sqrt(2))^(k-2)-(1-sqrt(2))^(k-2))/(2*sqrt(2))))))); return(M[1, 1])}
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CROSSREFS
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Cf. A119809 (constant), A119811 (continued fraction), A000129; A119812 (dual constant).
Sequence in context: A061421 A100360 A141315 this_sequence A064646 A144905 A083455
Adjacent sequences: A119808 A119809 A119810 this_sequence A119812 A119813 A119814
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KEYWORD
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frac,nonn
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AUTHOR
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Paul D. Hanna (pauldhanna(AT)juno.com), May 26 2006
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