OFFSET
1,2
EXAMPLE
0.61744687908060706735...
MATHEMATICA
RealDigits[ x /. FindRoot[Erf[x] == x, {x, 1}, WorkingPrecision -> 110]][[1]]
PROG
(PARI) solve(x=0.5, 1, x-(1-erfc(x))) \\ _Michel Marcus_, Nov 11 2015
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
_Devid Ferri_, Nov 11 2015
STATUS
approved