OFFSET
1,6
REFERENCES
M. Abramowitz and I. A. Stegun, eds., Handbook of Mathematical Functions, National Bureau of Standards Applied Math. Series 55, 1964 (and various reprintings), p. 811.
LINKS
M. Abramowitz and I. A. Stegun, eds., Handbook of Mathematical Functions, National Bureau of Standards, Applied Math. Series 55, Tenth Printing, 1972 [alternative scanned copy].
FORMULA
zeta(15) = Sum_{n >= 1} (A010052(n)/n^(15/2)) = Sum_{n >= 1} ( (floor(sqrt(n)) - floor(sqrt(n-1)))/n^(15/2) ). - Mikael Aaltonen, Feb 23 2015
zeta(15) = Product_{k>=1} 1/(1 - 1/prime(k)^15). - Vaclav Kotesovec, May 02 2020
EXAMPLE
1.0000305882363070204935517285106450625876279487068581775065699328933322...
MATHEMATICA
RealDigits[Zeta[15], 10, 120][[1]] (* Harvey P. Dale, Sep 22 2011 *)
CROSSREFS
KEYWORD
cons,nonn
AUTHOR
STATUS
approved