A083644 -id:A083644 - cp's OEIS frontend

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

Rick L. Shepherd, May 05 2003

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.

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

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 *)

A083645 Starting positions of strings of six 9's in the decimal expansion of Pi.

Original entry on oeis.org

762, 193034, 1722776, 1722777, 1985813, 2878443, 3062881, 3389380, 3389381, 3529731, 4313727, 4313728, 5466169, 5466170, 6951812, 7298585, 8498459, 11295221, 12943563, 13347753, 14388723, 14593770, 14593771, 14670295, 15256174, 15256175, 15866194, 16192557, 16785635

Offset: 1

Rick L. Shepherd, May 06 2003

Dave Andersen, Pi-Search Page
Eric Weisstein's World of Mathematics, Pi Digits.
Index entries for sequences related to the number Pi

Cf. A083644 (five 9's), A083646 (seven 9's).

SequencePosition[RealDigits[Pi,10,15*10^6][[1]],{9,9,9,9,9,9}][[All,1]]-1 (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Mar 19 2017 *)

More terms from Jinyuan Wang, Mar 01 2020

cp's OEIS Frontend

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

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