OFFSET
0,2
EXAMPLE
For n=7, a(7) = 293318625600 -> 5040 -> 60 -> 12 -> 6 -> 4 -> 3 -> 2.
For n=8, a(8) -> 1111523212800 -> 5040 -> 60 -> 12 -> 6 -> 4 -> 3 -> 2.
PROG
(PARI) a036459(n) = {if (n<=2, return(0)); nb = 1; while ((nd = numdiv(n)) > 2, n = nd; nb++); nb; }
a(n) = {k = 1; while (a036459(k) != n, k++); k; } \\ Michel Marcus, Oct 28 2015
CROSSREFS
KEYWORD
nonn
AUTHOR
Ivan Neretin, Mar 29 2015
STATUS
approved