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

1,1

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

Table of n, a(n) for n=1..21.

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

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 *)

Crossrefs

Cf. A083618 (six 4's).

Sequence in context: A159192 A154875 A015353 * A257550 A282670 A238071

Adjacent sequences: A083616 A083617 A083618 * A083620 A083621 A083622

Keyword

base,nonn,changed

Author

Rick L. Shepherd, May 02 2003

Extensions

More terms from Rick L. Shepherd, Aug 06 2006

Status

approved