A050284 a(n) is the starting position of the first occurrence of a string of (at least) n '5's in the decimal expansion of Pi.

4, 130, 177, 24466, 24466, 244453, 3517236, 168743355, 5050944965, 7644991298, 157675736216, 1618922020656, 7604259624808, 7604259624808

Offset

1,1

Comments

This sequence has a(4) = a(5) = A096759(5) < A096759(4). As can be seen from a(1) = 4 (referring to the '5' in 3.1415...), position p means the string starts at the p-th digit after the decimal point. - M. F. Hasler, Apr 13 2019

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

a(15) > 22*10^12. - Dmitry Petukhov, Jan 29 2020

Links

Table of n, a(n) for n=1..14.

Peter Trüb, 22.4 trillion digits of pi

Eric Weisstein's World of Mathematics, Pi Digits.

Crossrefs

Cf. A096759 (variant), ...A050283, A050285... (analog for digits ..., 4, 6, ...).

Sequence in context: A299136 A117897 A001425 * A096759 A299367 A299931

Adjacent sequences: A050281 A050282 A050283 * A050285 A050286 A050287

Keyword

nonn,base,more

Author

Eric W. Weisstein

Extensions

More terms from Colin Martin (cbmartin(AT)tpg.com.au), Mar 03 2002

Typo in a(10) corrected by Giovanni Resta, Oct 02 2019

a(11)-a(14) added by Dmitry Petukhov, Jan 12 2020

Status

approved