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Positions of 6's in the decimal expansion of Pi.
3

%I #18 May 31 2021 10:09:24

%S 8,21,23,42,70,73,76,83,99,109,118,119,128,182,185,201,212,213,220,

%T 227,235,240,254,258,259,264,269,277,278,287,291,310,311,313,333,348,

%U 351,360,378,379,388,398,411,427

%N Positions of 6's in the decimal expansion of Pi.

%H Vincenzo Librandi, <a href="/A053750/b053750.txt">Table of n, a(n) for n = 1..1000</a>

%H <a href="/index/Ph#Pi314">Index entries for sequences related to the number Pi</a>

%F a(n) = A037005(n) + 1. - _Georg Fischer_, May 31 2021

%t Flatten[Position[RealDigits[Pi, 10, 1000][[1]], 6]] (* _Vincenzo Librandi_, Oct 07 2013 *)

%Y Cf. A037005.

%K nonn,base

%O 1,1

%A _Simon Plouffe_, Feb 20 2000