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Positions of 4's in the decimal expansion of sqrt(2).
3

%I #14 Jul 31 2019 15:17:08

%S 2,4,18,28,51,71,74,91,96,108,121,124,141,142,146,158,200,220,223,232,

%T 239,243,263,265,271,275,296,312,324,343,345,385,388,392,395,399,418,

%U 426,427,437,439,441,449,467,511

%N Positions of 4's in the decimal expansion of sqrt(2).

%H G. C. Greubel, <a href="/A054300/b054300.txt">Table of n, a(n) for n = 1..10000</a>

%t Flatten[Position[RealDigits[Sqrt[2],10,600][[1]],4]] (* _Harvey P. Dale_, Aug 03 2012 *)

%K nonn,base

%O 1,1

%A _Simon Plouffe_, Feb 20 2000