A083643 Starting positions of strings of four 9's in the decimal expansion of Pi.

762, 763, 764, 17988, 19437, 19446, 19447, 22753, 31900, 42095, 56988, 56989, 81293, 120564, 140953, 161862, 161863, 177122, 182604, 191104, 193034, 193035, 193036, 204198, 210140, 211794, 220507, 220568, 220569, 224317, 235425, 235775

Offset

1,1

Links

Harvey P. Dale, Table of n, a(n) for n = 1..1000

Index entries for sequences related to the number Pi

Dave Andersen, Pi-Search Page

Eric Weisstein's World of Mathematics, Pi Digits.

Mathematica

Transpose[StringPosition[StringDrop[ToString[N[Pi, 9! ]], 2], "9999"]][[1]] (* Vladimir Joseph Stephan Orlovsky, Jun 19 2009 *)
Module[{digs=240000, p}, p=RealDigits[Pi, 10, digs][[1]]; SequencePosition[p, {9, 9, 9, 9}][[All, 1]]-1] (* Harvey P. Dale, Jan 12 2023 *)

Crossrefs

Cf. A083642 (three 9's), A083644 (five 9's).

Sequence in context: A139664 A160033 A083642 * A083644 A061225 A253615

Adjacent sequences: A083640 A083641 A083642 * A083644 A083645 A083646

Keyword

base,nonn

Author

Rick L. Shepherd, May 05 2003

Status

approved