OFFSET
1,6
LINKS
Eric Weisstein's World of Mathematics, Dedekind Eta Function
Eric Weisstein's World of Mathematics, q-Pochhammer Symbol
Wikipedia, Dedekind eta function
Wikipedia, Euler function
FORMULA
Equals (sqrt(9 + 6*sqrt(3)) - 2 - sqrt(3))^(1/3) * exp(Pi/8) / 2^(3/8).
EXAMPLE
1.000080706031033622547633753827481510343808241636336645922722085133112...
MATHEMATICA
RealDigits[(Sqrt[9 + 6*Sqrt[3]] - 2 - Sqrt[3])^(1/3) * E^(Pi/8)/ 2^(3/8), 10, 120][[1]]
RealDigits[QPochhammer[-1, E^(-3*Pi)]/2, 10, 120][[1]]
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Vaclav Kotesovec, Sep 26 2017
STATUS
approved