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%I #12 Jul 24 2019 02:02:07
%S 4,15,24,30,33,39,50,61,71,91,109,117,135,139,140,152,157,168,183,186,
%T 190,193,208,223,236,239,269,272,287,293,296,310,319,324,329,351,358,
%U 367,387,400,408,421,430,431,435
%N Positions of 2's in the decimal expansion of Euler's constant.
%H G. C. Greubel, <a href="/A054308/b054308.txt">Table of n, a(n) for n = 1..10000</a>
%t Flatten[Position[RealDigits[EulerGamma,10,500][[1]],2]] (* _Harvey P. Dale_, Aug 21 2015 *)
%K nonn,base
%O 1,1
%A _Simon Plouffe_, Feb 20 2000