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.

9, 137, 2120, 3496, 88008, 176451, 25198140, 50366472, 1660042751, 7902183159, 260816757309, 1142905318634, 17475119650043, 43420162171515

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(15) > 50*10^12. - Dmitry Petukhov, Oct 27 2021

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..14.

Dave Andersen, The Pi-Search Page

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

Timothy Mullican, 50 trillion digits of pi

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 A367426

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

a(14) from Dmitry Petukhov, Oct 27 2021

Status

approved