A050209 Starting positions of strings of 3 1's in the decimal expansion of Pi.

153, 983, 3503, 3992, 4508, 6116, 6803, 6963, 8366, 11730, 12527, 12611, 12700, 12701, 13597, 14375, 15190, 16732, 16733, 19627, 22270, 22897, 23208, 23244, 23660, 25205, 25448, 25752, 27053, 29492, 29687, 29810, 31281, 31488, 32498

Offset

1,1

Comments

The "position" is the number of digits to the right of the decimal point. - Harvey P. Dale, Jan 02 2019

Links

Table of n, a(n) for n=1..35.

Eric Weisstein's World of Mathematics, Pi Digits

Index entries for sequences related to the number Pi

Maple

Pidigs:= convert(evalf[40000](Pi), string):
StringTools[SearchAll]("111", Pidigs[3..-1]); # Robert Israel, Jan 09 2015

Mathematica

a=RealDigits[Pi, 10, 9! ]; lst={}; Do[b=a[[1]][[n]]; c=a[[1]][[n+1]]; d=a[[1]][[n+2]]; If[b==1&&c==1&&d==1, AppendTo[lst, n-1]], {n, 9!-2}]; lst (* Vladimir Joseph Stephan Orlovsky, Jun 02 2009 *)
SequencePosition[RealDigits[Pi, 10, 33000][[1]], {1, 1, 1}][[All, 1]]-1 (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Jan 02 2019 *)

Crossrefs

Cf. A000796.

Sequence in context: A199851 A181775 A193249 * A109142 A014576 A087414

Adjacent sequences: A050206 A050207 A050208 * A050210 A050211 A050212

Keyword

nonn,base

Author

Eric W. Weisstein

Status

approved