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Positions of 7's in the decimal expansion of exp(1).
1

%I #25 May 20 2019 07:08:50

%S 2,25,27,37,38,40,43,54,61,64,65,69,79,84,90,100,103,124,138,158,169,

%T 176,188,204,211,215,235,242,264,265,272,283,286,291,292,293,305,308,

%U 332,349,353,355,362,368,373,377

%N Positions of 7's in the decimal expansion of exp(1).

%C A001113 is the decimal expansion of the constant e.

%H Vincenzo Librandi, <a href="/A054283/b054283.txt">Table of n, a(n) for n = 1..1000</a>

%t Flatten[Position[RealDigits[N[E,500]][[1]],7]] (* _Harvey P. Dale_, Feb 01 2011 *)

%Y Cf. A001113, A054276, A054277, A054278, A054279, A054280, A054281, A054282, A054284, A054285.

%K nonn,base

%O 1,1

%A _Simon Plouffe_, Feb 20 2000