OFFSET
0,1
LINKS
Michael I. Shamos, A catalog of the real numbers, (2011). See p. 457.
FORMULA
Equals (cosh(1) - cos(1))/2.
EXAMPLE
1/2! + 1/6! + 1/10! + ... = 0.5013891644735520305...
MATHEMATICA
RealDigits[(Cosh[1] - Cos[1])/2, 10, 110] [[1]]
PROG
(PARI) suminf(k=0, 1/(4*k+2)!) \\ Michel Marcus, Apr 25 2020
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Ilya Gutkovskiy, Apr 24 2020
STATUS
approved