OFFSET
-1,1
LINKS
Michael I. Shamos, A catalog of the real numbers (2011).
FORMULA
Equals 1/cosh(Pi).
Equals 2/A175314.
Equals (2*e^Pi)/(e^(2*Pi) + 1).
Equals Sum_{k>=0} 2*e^((i - 2)k*Pi - Pi).
Equals lim_{n->oo} (-2*e^(Pi - 2*Pi*n))*(e^(i*Pi*n) - e^(2*Pi*n))/(e^(2*Pi) + 1).
EXAMPLE
0.086266738334054414696554046331336803913919401857363678077401978352...
MATHEMATICA
RealDigits[Sech[Pi], 10, 105][[1]]
CROSSREFS
KEYWORD
cons,nonn
AUTHOR
Wolfe Padawer, Jan 28 2023
STATUS
approved