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A083607 Starting positions of strings of 4 2's in the decimal expansion of Pi. 2
4902, 7964, 12486, 43405, 50271, 55736, 62920, 65260, 65261, 71778, 83521, 97191, 98423, 103025, 105290, 123462, 125053, 125172, 125656, 138493, 138655, 150949, 162191, 192255, 196397, 204561, 204850, 209562, 216368, 216660, 267139, 272809 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

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

Dave Andersen, Pi-Search Page

Eric Weisstein's World of Mathematics, Pi Digits.

Index entries for sequences related to the number Pi

MATHEMATICA

$MaxPrecision=10^8; a=RealDigits[Pi, 10, 9! ]; lst={}; Do[b=a[[1]][[n]]; c=a[[1]][[n+1]]; d=a[[1]][[n+2]]; e=a[[1]][[n+3]]; If[b==2&&c==2&&d==2&&e==2, AppendTo[lst, n-1]], {n, 6*6!, 9!-3}]; lst [From Vladimir Joseph Stephan Orlovsky, Jun 07 2009]

With[{p=Partition[Rest[RealDigits[Pi, 10, 300000][[1]]], 4, 1]}, Flatten[ Position[ p, {2, 2, 2, 2}]]] (* Harvey P. Dale, Oct 10 2011 *)

CROSSREFS

Cf. A083606 (three 2's), A083608 (five 2's).

Sequence in context: A107545 A031658 A031568 * A168028 A031834 A179144

Adjacent sequences:  A083604 A083605 A083606 * A083608 A083609 A083610

KEYWORD

base,nonn

AUTHOR

Rick L. Shepherd, May 01 2003

STATUS

approved

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Last modified October 23 13:13 EDT 2014. Contains 248464 sequences.