OFFSET
6,1
COMMENTS
Also known as the 18th Bendersky constant.
LINKS
G. C. Greubel, Table of n, a(n) for n = 6..2007
FORMULA
A(k) = exp(H(k)*B(k+1)/(k+1) - zeta'(-k)), where B(k) is the k-th Bernoulli number, H(k) the k-th harmonic number, and zeta'(x) is the derivative of the Riemann zeta function.
A(18) = exp((B(18)/4)*(zeta(19)/zeta(18))) = exp(-zeta'(-18)).
A(18) = exp(18! * Zeta(19) / (2^19 * Pi^18)). - Vaclav Kotesovec, Jan 01 2016
EXAMPLE
929840.411822940088043113785037604334445353815966558489979361...
MATHEMATICA
Exp[N[(BernoulliB[18]/4)*(Zeta[19]/Zeta[18]), 200]]
CROSSREFS
Cf. A019727 (A(0)), A074962 (A(1)), A243262 (A(2)), A243263 (A(3)), A243264 (A(4)), A243265 (A(5)), A266553 (A(6)), A266554 (A(7)), A266555 (A(8)), A266556 (A(9)), A266557 (A(10)), A266558 (A(11)), A266559 (A(12)), A260662 (A(13)), A266560 (A(14)), A266562 (A(15)), A266563 (A(16)), A266564 (A(17)), A266566 (A(19)), A266567 (A(20)).
KEYWORD
nonn,cons
AUTHOR
G. C. Greubel, Dec 31 2015
STATUS
approved