%I #15 Jul 24 2019 00:36:23
%S 9,23,32,39,41,49,58,59,75,95,109,127,140,164,165,195,212,226,228,242,
%T 251,282,284,287,302,310,313,323,326,329,357,389,402,406,413,436,447,
%U 454,458,468,475,476,477,488,492
%N Positions of 6's in the decimal expansion of sqrt(2).
%H G. C. Greubel, <a href="/A054302/b054302.txt">Table of n, a(n) for n = 1..10000</a>
%t Flatten[Position[RealDigits[Sqrt[2],10,500][[1]],6]] (* _Harvey P. Dale_, Jul 21 2013 *)
%K nonn,base
%O 1,1
%A _Simon Plouffe_, Feb 20 2000