A083615 Starting positions of strings of three 4's in the decimal expansion of Pi.

2707, 2928, 3476, 3809, 3866, 4175, 4923, 5290, 5675, 6327, 6346, 9384, 9445, 13565, 18912, 21929, 23157, 23223, 25937, 26531, 27887, 28220, 28872, 34587, 35496, 36878, 37072, 37758, 37989, 39388, 39826, 42220, 42424, 45136, 45796, 46495

Offset

1,1

Links

Table of n, a(n) for n=1..36.

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=4; 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 *)
With[{p=Partition[RealDigits[Pi, 10, 50000][[1]], 3, 1]}, Flatten[Position[ p, _?(# == {4, 4, 4}&)]]-1] (* Harvey P. Dale, Nov 22 2014 *)
SequencePosition[RealDigits[Pi, 10, 50000][[1]], {4, 4, 4}][[All, 1]]-1 (* Harvey P. Dale, Apr 11 2022 *)

Crossrefs

Cf. A050230 (two 4's), A083616 (four 4's).

Sequence in context: A205605 A205436 A031550 * A205750 A205472 A252430

Adjacent sequences: A083612 A083613 A083614 * A083616 A083617 A083618

Keyword

base,nonn

Author

Rick L. Shepherd, May 02 2003

Status

approved