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A053753 Positions of 9's in the decimal expansion of Pi. 8
6, 13, 15, 31, 39, 43, 45, 46, 56, 59, 63, 80, 81, 101, 123, 130, 145, 170, 181, 188, 191, 194, 200, 209, 215, 248, 250, 260, 285, 295, 329, 332, 337, 342, 354, 357, 389, 392, 400, 415, 417, 419, 423, 434, 441, 460, 461, 466, 483, 488, 497, 499, 502, 528, 530, 534, 543, 550 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Here "position" is 1, 2, 3, ... for the digits 3, 1, 4, ..., in contrast to A037007(n) = a(n)-1 and other sequences (A048940, A096763, ...) using "offset 0" for the position. - M. F. Hasler, Mar 20 2017

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

Index entries for sequences related to the number Pi

R. K. Hoeflin, Ultra Test. [Fixed broken link, replaced deleted page by web.archive backup, but the reference seems irrelevant. - M. F. Hasler, Mar 20 2017]

MATHEMATICA

Flatten[Position[RealDigits[Pi, 10, 1000][[1]], 9]] (* Vincenzo Librandi, Oct 07 2013 *)

PROG

(PARI) default(realprecision, 1999); for(i=2, #T=Vec(Str(Pi)), T[i-1]=="9"&&print1(i-2", ")) \\ Exclude last digit from search. - M. F. Hasler, Mar 20 2017

CROSSREFS

Cf. A037007, A048940, A096763, and the link to the OEIS index.

Sequence in context: A112610 A100205 A140888 * A228380 A090068 A070899

Adjacent sequences:  A053750 A053751 A053752 * A053754 A053755 A053756

KEYWORD

nonn,base

AUTHOR

Simon Plouffe, Feb 20 2000

STATUS

approved

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Last modified July 29 04:52 EDT 2021. Contains 346340 sequences. (Running on oeis4.)