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Search: id:A047789
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| A047789 |
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Denominators of Glaisher's I-numbers. |
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+0
5
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| 2, 3, 1, 1, 9, 1, 1, 3, 1, 1, 3, 1, 1, 27, 1, 1, 3, 1, 1, 3, 1, 1, 9, 1, 1, 3, 1, 1, 3, 1, 1, 9, 1, 1, 3, 1, 1, 3, 1, 1, 81, 1, 1, 3, 1, 1, 3, 1, 1, 9, 1, 1, 3, 1, 1, 3, 1, 1, 9, 1, 1, 3, 1, 1, 3, 1, 1, 27, 1, 1, 3, 1, 1, 3, 1, 1, 9, 1, 1, 3, 1, 1, 3, 1, 1, 9, 1, 1, 3, 1, 1, 3, 1, 1, 27, 1, 1, 3, 1, 1, 3, 1
(list; graph; listen)
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OFFSET
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0,1
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REFERENCES
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J. W. L. Glaisher, On a set of coefficients analogous to the Eulerian numbers, Proc. London Math. Soc., 31 (1899), 216-235.
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LINKS
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Index entries for sequences related to Glaisher's numbers
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EXAMPLE
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1/2, 1/3, 1, 7, 809/9, 1847, 55601, 6921461/3,...
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PROGRAM
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(PARI) a(n)=if(n<1, 2*(n==0), 3^valuation(2*n+1, 3)) - Michael Somos Feb 26 2004
(PARI) a(n)=if(n<1, 2*(n==0), n*=2; denominator(n!*polcoeff(3/(2+4*cos(x+O(x^n))), n))) - Michael Somos Feb 26 2004
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CROSSREFS
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Cf. A047788, A002111.
Sequence in context: A140878 A068348 A135900 this_sequence A068869 A064529 A091654
Adjacent sequences: A047786 A047787 A047788 this_sequence A047790 A047791 A047792
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KEYWORD
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nonn,frac
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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