A083632 - OEIS

A083632

Starting positions of strings of four 7's in the decimal expansion of Pi.

1589, 5241, 5322, 5863, 29504, 32478, 33107, 35457, 40792, 52313, 69841, 81356, 87288, 95735, 96505, 96984, 126389, 135083, 137923, 138108, 145767, 151494, 156637, 162248, 162249, 188346, 197069, 203946, 208362, 211588, 221435, 233147

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OFFSET

1,1

COMMENTS

Starting position counted from and after the decimal point. - Harvey P. Dale, Feb 22 2023

LINKS

Table of n, a(n) for n=1..32.

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], "7777"]][[1]] (* Vladimir Joseph Stephan Orlovsky, Jun 19 2009 *)

SequencePosition[RealDigits[Pi, 10, 240000][[1]], {7, 7, 7, 7}][[;; , 1]]-1 (* Harvey P. Dale, Feb 22 2023 *)

CROSSREFS

Cf. A083631 (three 7's), A083633 (five 7's).

Sequence in context: A233378 A083631 A224938 * A224939 A049520 A252085

Adjacent sequences: A083629 A083630 A083631 * A083633 A083634 A083635

KEYWORD

base,nonn,changed

AUTHOR

Rick L. Shepherd, May 04 2003

STATUS

approved