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Positions of 5's in the decimal expansion of sqrt(2).
3

%I #15 Jul 31 2019 16:18:08

%S 8,16,38,46,84,89,98,103,129,130,132,154,166,170,172,173,177,178,183,

%T 185,189,197,206,207,214,221,224,236,254,255,276,292,294,306,311,331,

%U 333,336,340,342,346,348,354,364

%N Positions of 5's in the decimal expansion of sqrt(2).

%H G. C. Greubel, <a href="/A054301/b054301.txt">Table of n, a(n) for n = 1..10000</a>

%t Position[RealDigits[Sqrt[2],10,400][[1]],5]//Flatten (* _Harvey P. Dale_, Apr 18 2018 *)

%Y Cf. A002193.

%K nonn,base

%O 1,1

%A _Simon Plouffe_, Feb 20 2000