A153230 Numbers k such that the string k is found at position k^2 in the decimal digits of Pi.

1, 3, 22, 596

Offset

1,2

Comments

a(5) > 10^4, if it exists. - Amiram Eldar, May 06 2024

Links

Table of n, a(n) for n=1..4.

Example

22 is in the sequence because 22 occurs at position 484 (22^2) after the decimal point in the digits of Pi.

Mathematica

With[{m = 10^3}, s = Rest@ RealDigits[Pi, 10, m^2][[1]]; q[n_] := s[[n^2 + Range[0, IntegerLength[n] - 1]]] == RealDigits[n][[1]]; Select[Range[m - 1], q]] (* Amiram Eldar, May 06 2024 *)

Crossrefs

Cf. A000796, A057679, A057680, A109513, A109514.

Sequence in context: A119770 A272659 A233748 * A195462 A276749 A232016

Adjacent sequences: A153227 A153228 A153229 * A153231 A153232 A153233

Keyword

base,more,nonn

Author

Gil Broussard, Dec 21 2008

Status

approved