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A081876 a(n) is the starting position of the second occurrence of a string of the initial n decimal digits of Pi in the decimal expansion of Pi. 1
9, 137, 2120, 3496, 88008, 176451, 25198140, 50366472, 1660042751, 7902183159, 260816757309, 1142905318634, 17475119650043 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

The digits 3 1 4 1 5 ... are labeled 0, 1, 2, 3, 4, ...

a(9) > 10^8. - Robert G. Wilson v, May 09 2003

a(14) > 22*10^12. - Dmitry Petukhov, Jan 27 2020

REFERENCES

Alfred S. Posamentier & Ingmar Lehmann, A Biography of the World's Most Mysterious Number, Prometheus Books, Amherst, NY 2004, page 134.

LINKS

Table of n, a(n) for n=1..13.

Dave Andersen, The Pi-Search Page

Yasumasa Kanada Laboratory Home Page, Computer Centre, The University of Tokyo, Statistical Distribution Information.

Harry J. Smith, Computing Pi [Broken link]

Harry J. Smith, Computing Pi

Peter Trüb, 22.4 trillion digits of pi

Pi search engine

CROSSREFS

Cf. A000796, A048940, A166028.

Sequence in context: A309189 A231757 A156975 * A139760 A112702 A296394

Adjacent sequences:  A081873 A081874 A081875 * A081877 A081878 A081879

KEYWORD

nonn,base,more

AUTHOR

Harry J. Smith, Apr 12 2003

EXTENSIONS

a(9) from Felix Fröhlich, Oct 04 2016

a(10)-a(11) from Andreas Stiller, Apr 08 2019

a(12) from Robert G. Wilson v, Oct 21 2004

a(13) from Dmitry Petukhov, Jan 27 2020

STATUS

approved

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Last modified February 27 11:38 EST 2021. Contains 341656 sequences. (Running on oeis4.)