A083631 Starting positions of strings of three 7's in the decimal expansion of Pi.

1589, 1590, 4575, 5241, 5242, 5322, 5323, 5355, 5450, 5863, 5864, 11298, 11733, 12661, 14292, 15501, 17234, 17502, 18516, 19903, 20404, 21423, 21571, 23538, 23749, 24373, 25551, 25788, 25858, 26796, 29504, 29505, 30988, 32478, 32479

Offset

1,1

Comments

Position counted from and after decimal point. - Harvey P. Dale, Mar 13 2023

Links

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

Index entries for sequences related to the number Pi

Dave Andersen, Pi-Search Page

Eric Weisstein's World of Mathematics, Pi Digits.

Mathematica

q=9!; z=7; a=RealDigits[Pi, 10, q]; lst={}; Do[b=a[[1]][[n]]; c=a[[1]][[n+1]]; d=a[[1]][[n+2]]; If[b==z&&c==z&&d==z, AppendTo[lst, n-1]], {n, q-2}]; lst (* Vladimir Joseph Stephan Orlovsky, Jun 19 2009 *)
SequencePosition[RealDigits[Pi, 10, 33000][[1]], {7, 7, 7}][[;; , 1]]-1 (* Harvey P. Dale, Mar 13 2023 *)

Crossrefs

Cf. A050254 (two 7's), A083632 (four 7's).

Sequence in context: A224942 A224950 A233378 * A224938 A083632 A224939

Adjacent sequences: A083628 A083629 A083630 * A083632 A083633 A083634

Keyword

base,nonn

Author

Rick L. Shepherd, May 04 2003

Status

approved