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A043303
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Numerator of B(4n+2)/(2n+1) where B(m) are the Bernoulli numbers.
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2
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1, 1, 1, 1, 43867, 77683, 657931, 1723168255201, 151628697551, 154210205991661, 1520097643918070802691, 25932657025822267968607, 19802288209643185928499101, 29149963634884862421418123812691
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OFFSET
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0,5
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COMMENTS
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Note that numerator of B(2n)/n is odd so B(2n)/(2n), B(2n)/(4n), etc. have the same numerators. - Michael Somos, Feb 01 2004
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REFERENCES
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Bruce Berndt, Ramanujan's Notebooks Part II, Springer-Verlag; see Infinite series, p. 262.
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LINKS
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FORMULA
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B(4n+2)/(8n+4) = sum_{k>=1} k^(4n+1)/(exp(2Pi*k)-1)).
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MAPLE
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seq(numer(bernoulli(4*n+2)/(2*n+1)), n=0..30); # Robert Israel, Sep 18 2016
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MATHEMATICA
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Table[BernoulliB[4n+2]/(2n+1), {n, 0, 20}]//Numerator (* Harvey P. Dale, Aug 13 2018 *)
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PROG
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(PARI) a(n)=if(n<0, 0, numerator(bernfrac(4*n+2)/(2*n+1)))
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CROSSREFS
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KEYWORD
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easy,frac,nonn
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AUTHOR
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STATUS
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approved
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