A083619 Starting positions of strings of seven 4's in the decimal expansion of Pi.

17893953, 22931745, 22931746, 23189751, 23724968, 26621347, 48484522, 65122865, 65122866, 101281206, 114016129, 139676210, 143452823, 158136797, 162805048, 180943775, 183739324, 187015739, 193053713, 195259463, 199439192

Offset: 1

Author

Rick L. Shepherd, May 02 2003

Keywords

• base
• nonn

Comments

The digits 3,1,4,... of Pi are indexed by 0,1,2,...

Consecutive numbers indicate a string of more than seven '4's in a row, e.g., at positions 22931745, 65122865, 221749424, 351988052, ... start runs of eight '4's. - M. F. Hasler, Mar 21 2017

Links

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

Crossrefs

Cf. A083618 (six 4's).

Programs

Mathematica

SequencePosition[RealDigits[Pi,10,2*10^8][[1]],{4,4,4,4,4,4,4}][[All,1]]-1 (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Mar 05 2020 *)

Extensions

More terms from Rick L. Shepherd, Aug 06 2006