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A084145 First digit occurring consecutively at least n times in Pi's decimal expansion. 2
3, 3, 1, 9, 9, 9, 3, 4, 7, 6, 1, 7, 8, 9, 6, 6, 6 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
A simple variation on this sequence could ignore the 3 before the decimal point, making a(1)=1 instead.
LINKS
Dave Andersen, Pi-Search Page
Timothy Mullican, 50 trillion digits of pi
Eric Weisstein's World of Mathematics, Pi Digits
EXAMPLE
a(4)=a(5)=a(6) = 9 because there are (exactly) six consecutive 9's occurring with starting index A049522(4)=A049522(5)=A049522(6) = 763 and there are no runs of 4, 5, 6, or more consecutive equal digits having a smaller starting index.
The first occurrence of a run of at least seven consecutive equal digits occurs at starting index A049522(7) = 710101. The run consists of exactly seven 3's so a(7) = 3 [=A084144(7)] and also A049523(7) = 710101.
CROSSREFS
Cf. A049522 (starting index), A084144 (consecutively exactly n times), A049523 (starting index for A084144 runs).
Sequence in context: A193824 A108075 A215120 * A122919 A188513 A260301
KEYWORD
base,nonn,more
AUTHOR
Rick L. Shepherd, May 23 2003
EXTENSIONS
a(10)-a(14) added by Dmitry Petukhov, Jan 13 2020
a(15)-a(17) from Dmitry Petukhov, Oct 30 2021
STATUS
approved

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Last modified March 19 03:33 EDT 2024. Contains 370952 sequences. (Running on oeis4.)