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%I #13 Sep 08 2022 08:46:12
%S 1,7,3,7,9,8,8,7,4,5,8,8,8,5,8,9,4,3,5,9,6,2,4,4,3,8,2,2,8,0,0,4,1,0,
%T 9,1,2,0,1,7,7,7,0,7,3,9,6,0,9,4,1,9,5,0,9,7,6,3,0,9,0,3,2,9,1,7,5,4,
%U 2,1,8,8,8,1,3,6,4,8,0,9,8,6,4,5,5,5,6,2,3,0,5,0,7,3,2,8,4,4,6,4,2,4,4,4,6
%N Decimal expansion of the generalized Euler constant gamma(3,3) (negated).
%H G. C. Greubel, <a href="/A256844/b256844.txt">Table of n, a(n) for n = 0..10000</a>
%H D. H. Lehmer, <a href="http://matwbn.icm.edu.pl/ksiazki/aa/aa27/aa27121.pdf">Euler constants for arithmetic progressions</a>, Acta Arith. 27 (1975) p. 134.
%F Equals EulerGamma/3 - log(3)/3.
%e -0.1737988745888589435962443822800410912017770739609419509763...
%t RealDigits[EulerGamma/3 - Log[3]/3, 10, 105] // First
%o (PARI) default(realprecision, 100); Euler/3 - log(3)/3 \\ _G. C. Greubel_, Aug 28 2018
%o (Magma) SetDefaultRealField(RealField(100)); R:= RealField(); EulerGamma(R)/3 - Log(3)/3; // _G. C. Greubel_, Aug 28 2018
%Y Cf. A001620 (gamma(1,1) = EulerGamma),
%Y 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),
%Y Other gamma(r,k) (1 <= r <= k <= 5): A239097 (2,2), A256843 (2,3), A256844 (3,3), A256845 (2,4), A256846 (3,4), A256847 (4,4), A256848 (3,5), A256849 (4,5), A256850 (5,5).
%K nonn,cons,easy
%O 0,2
%A _Jean-François Alcover_, Apr 11 2015
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