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Starting positions of strings of four 6's in the decimal expansion of Pi.
2

%I #16 Jan 16 2015 03:49:56

%S 21880,29868,32427,43523,48439,48440,59983,64870,74392,100537,102387,

%T 102388,124494,131591,140744,140745,141919,147343,151265,161077,

%U 162317,166974,180722,194824,200045,226102,250129,250130,252499,252500,252501

%N Starting positions of strings of four 6's in the decimal expansion of Pi.

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

%H Dave Andersen, <a href="http://www.angio.net/pi/piquery">Pi-Search Page</a>

%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/PiDigits.html">Pi Digits.</a>

%t Transpose[StringPosition[StringDrop[ToString[N[Pi,9! ]],2],"6666"]][[1]] (* _Vladimir Joseph Stephan Orlovsky_, Jun 19 2009 *)

%t Flatten[Position[Partition[RealDigits[Pi,10,260000][[1]],4,1], {6,6,6,6}]]-1 (* _Harvey P. Dale_, Apr 27 2012 *)

%Y Cf. A083625 (three 6's), A083627 (five 6's).

%K base,nonn

%O 1,1

%A _Rick L. Shepherd_, May 03 2003