This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A251483 #32 Oct 30 2015 04:46:59
%S A251483 1,3,4,6,12,60,5040,293318625600,
%T A251483 635197862493622653217009501211465321419691071212633792891415680000000000
%N A251483 Position of first occurrence of n in A036459.
%e A251483 For n=7, a(7) = 293318625600 -> 5040 -> 60 -> 12 -> 6 -> 4 -> 3 -> 2.
%e A251483 For n=8, a(8) -> 1111523212800 -> 5040 -> 60 -> 12 -> 6 -> 4 -> 3 -> 2.
%o A251483 (PARI) a036459(n) = {if (n<=2, return(0)); nb = 1; while ((nd = numdiv(n)) > 2, n = nd; nb++); nb;}
%o A251483 a(n) = {k = 1; while (a036459(k) != n, k++); k;} \\ _Michel Marcus_, Oct 28 2015
%Y A251483 Coincides with A009287 for n <= 7 (only).
%K A251483 nonn
%O A251483 0,2
%A A251483 _Ivan Neretin_, Mar 29 2015