A083643 -id:A083643 - cp's OEIS frontend

A083642 Starting positions of strings of three 9's in the decimal expansion of Pi.

762, 763, 764, 765, 2949, 7759, 8527, 9962, 11197, 11382, 13019, 16687, 17119, 17561, 17988, 17989, 18680, 19437, 19438, 19446, 19447, 19448, 19748, 21579, 22309, 22753, 22754, 23989, 24107, 25584, 26069, 26490, 27602, 28122, 28320

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. A050272 (two 9's), A083643 (four 9's).

Transpose[ StringPosition[ StringDrop[ ToString[ N[Pi, 28588]], 2], "999"]][[1]]
Flatten[With[{p=Partition[RealDigits[Pi,10,30000][[1]],3,1]},Position[p,{9,9,9}]]]-1 (* Harvey P. Dale, Jan 05 2013 *)
With[{pid=RealDigits[Pi,10,30000][[1]]},SequencePosition[pid,{9,9,9}]][[;;,1]]-1 (* Harvey P. Dale, Feb 18 2025 *)

A083644 Starting positions of strings of five 9's in the decimal expansion of Pi.

Original entry on oeis.org

762, 763, 19446, 56988, 161862, 193034, 193035, 220568, 456189, 626757, 1104484, 1143176, 1200370, 1240405, 1437382, 1500808, 1532245, 1593224, 1623041, 1681741, 1722776, 1722777, 1722778, 1985813, 1985814, 2280176, 2474024

Offset: 1

Rick L. Shepherd, May 06 2003

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

Cf. A083643 (four 9's), A083645 (six 9's).

Module[{nn=25*10^5,pid},pid=RealDigits[Pi,10,nn][[1]];SequencePosition[pid,{9,9,9,9,9}]][[;;,1]]-1 (* Harvey P. Dale, Dec 02 2024 *)

cp's OEIS Frontend

A083642 Starting positions of strings of three 9's in the decimal expansion of Pi.

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