OFFSET
0,1
LINKS
Eric Weisstein's World of Mathematics, Planck's Radiation Function
EXAMPLE
0.28375729638007552563...
MATHEMATICA
f[x_] := 1/(x^5*(E^(1/x)-1)); RealDigits[x /. FindRoot[f''[x], {x, 1/4}, WorkingPrecision -> 110], 10, 105][[1]] (* Amiram Eldar, Sep 08 2020 *)
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Eric W. Weisstein, Sep 26 2007
STATUS
approved