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A083632
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Starting positions of strings of four 7's in the decimal expansion of Pi.
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2
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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
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1,1
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COMMENTS
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Starting position counted from and after the decimal point. - Harvey P. Dale, Feb 22 2023
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LINKS
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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.
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MATHEMATICA
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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 *)
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CROSSREFS
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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
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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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