login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A050209 Starting positions of strings of 3 1's in the decimal expansion of Pi. 1
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 (list; graph; refs; listen; history; text; internal format)
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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified November 14 02:19 EST 2019. Contains 329108 sequences. (Running on oeis4.)