0,1
The value is in radians.
This constant is the limit for n -> infinity of ((sum_{k=1..n} arctan(1/k)) - log(n)). [Jean-François Alcover, Aug 07 2014, after Steven Finch]
Table of n, a(n) for n=0..104.
Steven R. Finch, Errata and Addenda to Mathematical Constants, p. 5.
-arg(i*Gamma(i)), since i! = Gamma(1+i) = i*Gamma(i).
Equals arctan(A212878/A212877). - Vaclav Kotesovec, Dec 10 2015
0.30164032046753319788753165779...
RealDigits[-Arg[Gamma[1 + I]], 10, 105] // First (* Jean-François Alcover, Aug 07 2014 *)
Cf. A212877 (real(i!)), A212878 (-imag(i!)), A212879 (abs(i!)).
Sequence in context: A247255 A105147 A111924 * A211510 A243984 A100485
Adjacent sequences: A212877 A212878 A212879 * A212881 A212882 A212883
nonn,cons,easy
Stanislav Sykora, May 29 2012
approved