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A083631
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Starting positions of strings of three 7's in the decimal expansion of Pi.
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1
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1589, 1590, 4575, 5241, 5242, 5322, 5323, 5355, 5450, 5863, 5864, 11298, 11733, 12661, 14292, 15501, 17234, 17502, 18516, 19903, 20404, 21423, 21571, 23538, 23749, 24373, 25551, 25788, 25858, 26796, 29504, 29505, 30988, 32478, 32479
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OFFSET
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1,1
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COMMENTS
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Position counted from and after decimal point. - Harvey P. Dale, Mar 13 2023
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LINKS
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Table of n, a(n) for n=1..35.
Index entries for sequences related to the number Pi
Dave Andersen, Pi-Search Page
Eric Weisstein's World of Mathematics, Pi Digits.
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MATHEMATICA
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q=9!; z=7; a=RealDigits[Pi, 10, q]; lst={}; Do[b=a[[1]][[n]]; c=a[[1]][[n+1]]; d=a[[1]][[n+2]]; If[b==z&&c==z&&d==z, AppendTo[lst, n-1]], {n, q-2}]; lst (* Vladimir Joseph Stephan Orlovsky, Jun 19 2009 *)
SequencePosition[RealDigits[Pi, 10, 33000][[1]], {7, 7, 7}][[;; , 1]]-1 (* Harvey P. Dale, Mar 13 2023 *)
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CROSSREFS
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Cf. A050254 (two 7's), A083632 (four 7's).
Sequence in context: A224942 A224950 A233378 * A224938 A083632 A224939
Adjacent sequences: A083628 A083629 A083630 * A083632 A083633 A083634
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KEYWORD
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base,nonn
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AUTHOR
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Rick L. Shepherd, May 04 2003
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STATUS
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approved
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