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 A054039 a(n)^2 is the least square to contain n different decimal digits. 13
 0, 4, 13, 32, 113, 322, 1017, 3206, 10124, 32043 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS It turns out that "...at least n..." and "...exactly n..." yield the same (and thus strictly increasing) sequence. - M. F. Hasler, Feb 02 2009 LINKS EXAMPLE 13^2=169 is the first square to contain exactly 3 different digits; 322^2=103684 is the first square to contain exactly 6 different digits. PROG (PARI) A054039(n, k=0) = { while( #Set(Vec(Str(k^2)))

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Last modified June 1 02:09 EDT 2020. Contains 334758 sequences. (Running on oeis4.)