A053753 Positions of 9's in the decimal expansion of Pi.

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

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: A100205 A353442 A140888 * A228380 A090068 A070899

Adjacent sequences: A053750 A053751 A053752 * A053754 A053755 A053756

Keyword

nonn,base

Author

Simon Plouffe, Feb 20 2000

Status

approved