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A276992 First 2-digit number to appear n times in the decimal expansion of Pi. 8
31, 26, 93, 62, 82, 28, 28, 28, 48, 48, 48, 48, 48, 9, 9, 81, 17, 17, 95, 95, 95, 95, 95, 95, 95, 19, 21, 21, 21, 19, 95, 9, 9, 9, 95, 46, 95, 59, 9, 9, 9, 95, 95, 95, 95, 59, 59, 59, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 14, 14, 14, 9, 9, 9, 9, 14, 9, 9 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

a(n) is the 2-digit number that appears in Pi n times before any other 2-digit number appears in Pi n times.

Note that the sequence contains elements whose number of digits is 2 or 1, see examples. - Omar E. Pol, Oct 05 2016

LINKS

Alois P. Heinz, Table of n, a(n) for n = 1..10000

EXAMPLE

a(2) = 26 because 26 is the first 2-digit number to appear 2 times in the decimal expansion of Pi = 3.14159(26)5358979323846(26)...

a(14) = 9 because "09" is the first 2-digit number to appear 14 times in the decimal expansion of Pi.

MATHEMATICA

spi = ToString[Floor[10^100000 Pi]]; f[n_] := Block[{k = 2}, While[Length@ StringPosition[ StringTake[spi, k], StringTake[spi, {k - 1, k}]] != n, k++]; ToExpression@ StringTake[spi, {k - 1, k}]]; Apply[f, 72] (* Robert G. Wilson v, Oct 05 2016 *)

CROSSREFS

Cf. A000796, A096567, A276686, A276993, A277171, A277270, A291599, A291600.

Sequence in context: A298724 A299558 A291471 * A008685 A162156 A141529

Adjacent sequences:  A276989 A276990 A276991 * A276993 A276994 A276995

KEYWORD

base,nonn

AUTHOR

Bobby Jacobs, Sep 24 2016

EXTENSIONS

a(21)-a(40) from Bobby Jacobs, Oct 01 2016

More terms from Alois P. Heinz, Oct 02 2016

STATUS

approved

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Last modified August 7 17:34 EDT 2020. Contains 336278 sequences. (Running on oeis4.)