A096756 Index of first occurrence of exactly n consecutive twos in a row in the decimal expansion of Pi.

6, 135, 1735, 4902, 65260, 963024, 82599811, 175820910, 1270311937, 20717271655, 225023890967, 1479132847647, 5547233660249

Offset: 1

Author

Robert G. Wilson v, Jul 07 2004

Keywords

• nonn
• base
• more

Comments

Presently identical to A050281, but it can be expected that the two will eventually differ, namely, as soon as a(n) > a(n+1) and A050281(n) = A050281(n+1).

a(10) > 2*10^9, according to the SubIdiom.com search engine. - M. F. Hasler, Apr 13 2019

a(11) > 99*10^9. - Giovanni Resta, Oct 02 2019

a(14) > 22*10^12. - Dmitry Petukhov, Jan 28 2020

Examples

			Pi = 3.1415926... has a "run" of exactly one '2' in the 6th place after the decimal point, therefore a(1) = 6.
		

Links

• David G. Andersen, The Pi-Search Page.
• Peter Trüb, 22.4 trillion digits of pi

Crossrefs

Cf. A050281, A035117, A096757, A096758, A096759, A096760, A096761, A096762, A096763, A050279.

Extensions

a(10) from Giovanni Resta, Oct 02 2019

a(11)-a(13) from Dmitry Petukhov, Jan 14 2020