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A153230
Numbers k such that the string k is found at position k^2 in the decimal digits of Pi.
0
1, 3, 22, 596
OFFSET
1,2
COMMENTS
a(5) > 10^4, if it exists. - Amiram Eldar, May 06 2024
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
KEYWORD
base,more,nonn
AUTHOR
Gil Broussard, Dec 21 2008
STATUS
approved