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A083607
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Starting positions of strings of four 2's in the decimal expansion of Pi.
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2
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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
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OFFSET
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1,1
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LINKS
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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
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MATHEMATICA
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$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 (* 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 *)
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CROSSREFS
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Cf. A083606 (three 2's), A083608 (five 2's).
Sequence in context: A107545 A031658 A031568 * A168028 A031834 A250908
Adjacent sequences: A083604 A083605 A083606 * A083608 A083609 A083610
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KEYWORD
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base,nonn
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AUTHOR
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Rick L. Shepherd, May 01 2003
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STATUS
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approved
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