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A331881 a(n) is the first n-digit substring to occur n times in the decimal expansion of the fractional part of Pi. 1
1, 26, 446, 2796, 86538, 872117, 1591292, 66416662 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..8.

EXAMPLE

a(1) = 1, because '1' is the first 1-digit string appearing 1 time (at position 1);

a(2) = 26, because '26' is the first 2-digit string appearing 2 times (at positions 6 and 21);

a(3) =  446, because '446' is the first 3-digit string appearing 3 times (at positions 125, 182 and 217);

and so on.

CROSSREFS

Cf. A000796, A197123.

Cf. A331882 (the number of digits needed to find the repeated n-digit strings).

Sequence in context: A024438 A025999 A028058 * A024170 A028042 A023956

Adjacent sequences:  A331878 A331879 A331880 * A331882 A331883 A331884

KEYWORD

base,nonn,hard,more

AUTHOR

Stijn Dierckx, Jan 30 2020

STATUS

approved

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Last modified June 17 12:26 EDT 2021. Contains 345080 sequences. (Running on oeis4.)