OFFSET
0,2
LINKS
G. C. Greubel, Table of n, a(n) for n = 0..10000
D. H. Lehmer, Euler constants for arithmetic progressions, Acta Arith. 27 (1975) p. 134.
FORMULA
Equals EulerGamma/3 - log(3)/3.
EXAMPLE
-0.1737988745888589435962443822800410912017770739609419509763...
MATHEMATICA
RealDigits[EulerGamma/3 - Log[3]/3, 10, 105] // First
PROG
(PARI) default(realprecision, 100); Euler/3 - log(3)/3 \\ G. C. Greubel, Aug 28 2018
(Magma) SetDefaultRealField(RealField(100)); R:= RealField(); EulerGamma(R)/3 - Log(3)/3; // G. C. Greubel, Aug 28 2018
CROSSREFS
Cf. A001620 (gamma(1,1) = EulerGamma),
Primitive ruler-and-compass constructible gamma(r,k): A228725 (1,2), A256425 (1,3), A256778 (1,4), A256779 (1,5), A256780 (2,5), A256781 (1,8), A256782 (3,8), A256783 (1,12), A256784 (5,12),
KEYWORD
AUTHOR
Jean-François Alcover, Apr 11 2015
STATUS
approved