%N The fractal sequence associated with A125153.
%C If you delete the first occurrence of each n, the remaining sequence is the original sequence; thus the sequence contains itself as a proper subsequence (infinitely many times).
%D Clark Kimberling, Interspersions and fractal sequences associated with fractions (c^j)/(d^k), Journal of Integer Sequences 10 (2007, Article 07.5.1) 1-8..
%H C. Kimberling, <a href="http://faculty.evansville.edu/ck6/integer/fractals.html">Fractal Sequences</a>.
%F a(n)=number of the row of array A125153 that contains n.
%e 1 is in row 1 of A125153; 2 in row 2; 3 in row 3;
%e 4 in row 1; 5 in row 4; 6 in row 2, so the fractal
%e sequence starts with 1,2,3,1,4,2
%Y Cf. A125153.
%A _Clark Kimberling_, Nov 21 2006