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Positions of 4's in the decimal expansion of Euler's constant.
1

%I #10 Jul 24 2019 02:02:27

%S 9,31,34,38,63,66,78,86,95,98,102,106,107,110,118,126,129,130,134,141,

%T 149,150,167,182,194,198,212,252,257,266,276,281,285,291,295,321,328,

%U 336,341,357,360,373,409,438,445

%N Positions of 4's in the decimal expansion of Euler's constant.

%H G. C. Greubel, <a href="/A054310/b054310.txt">Table of n, a(n) for n = 1..10000</a>

%t Flatten[Position[RealDigits[EulerGamma, 10, 500][[1]], 4]] (* _G. C. Greubel_, Jul 23 2019 *)

%K nonn,base

%O 1,1

%A _Simon Plouffe_, Feb 20 2000