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A073100 Denominator of b(n) = n*sum(k=2^n,2^(n+1)-1,(-1)^k/k). 1

%I

%S 6,210,120120,18050444111700,118226688410282226751136160,

%T 1112813007583117631616979100370019711878239390670756000,

%U 1191035057635417333689929196555456096447880322064975132139675263681349241137859495385119040334214863238544000

%N Denominator of b(n) = n*sum(k=2^n,2^(n+1)-1,(-1)^k/k).

%D G. Vacca,"A new series for the Eulerian constant", Quart. J. Pure Appl. Math.,1910, vol. 41, p. 363-368

%F Sum( k>=1, b(k) ) = gamma =0, 5772.....

%o (PARI) a(n)=denominator( n*sum(k=2^n,2^(n+1)-1,(-1)^k/k))

%Y Cf. A001620, A073099.

%K easy,frac,nonn

%O 1,1

%A _Benoit Cloitre_, Aug 18 2002

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Last modified May 25 07:08 EDT 2020. Contains 334584 sequences. (Running on oeis4.)