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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.)