A083606 Starting positions of strings of three 2's in the decimal expansion of Pi.

1735, 1889, 2278, 2376, 3434, 4902, 4903, 7911, 7964, 7965, 9203, 9293, 9334, 10427, 11704, 12486, 12487, 12857, 13040, 13562, 13725, 14668, 16679, 17619, 17882, 19099, 19479, 21576, 25469, 26266, 26959, 27433, 29447, 30291, 30454, 30527

Offset: 1

Author

Rick L. Shepherd, May 01 2003

Keywords

• base
• nonn

Links

• Index entries for sequences related to the number Pi
• Dave Andersen, Pi-Search Page
• Eric Weisstein's World of Mathematics, Pi Digits.

Crossrefs

Cf. A050215 (two 2's), A083607 (four 2's).

Programs

Mathematica

a=RealDigits[Pi,10,7*7! ];lst={};Do[b=a[[1]][[n]];c=a[[1]][[n+1]];d=a[[1]][[n+2]];If[b==2&&c==2&&d==2,AppendTo[lst,n-1]],{n,6!,7*7!-2}];lst (* Vladimir Joseph Stephan Orlovsky, Jun 07 2009 *)
#-1&/@(Flatten[Position[Union[#]&/@Partition[RealDigits[Pi,10,35000][[1]], 3,1],{2}]]) (* Harvey P. Dale, Oct 01 2011 *)
SequencePosition[RealDigits[Pi,10,35000][[1]],{2,2,2}][[;;,1]]-1 (* Harvey P. Dale, Apr 09 2023 *)