OFFSET
1,2
REFERENCES
Steven R. Finch, Mathematical Constants, Cambridge University Press, 2003, Section 2.6 Niven's constant, p. 113.
LINKS
Wikipedia, Powerful number
EXAMPLE
-1.4879506635322726315987491125787134987961...
MATHEMATICA
RealDigits[ Zeta[2/3] / Zeta[2], 10, 101] // First
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Jean-François Alcover, Jun 17 2014
STATUS
approved