A251483 Position of first occurrence of n in A036459.

1, 3, 4, 6, 12, 60, 5040, 293318625600, 635197862493622653217009501211465321419691071212633792891415680000000000

Offset: 0

Author

Ivan Neretin, Mar 29 2015

Keywords

• nonn

Examples

			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.
		

Crossrefs

Coincides with A009287 for n <= 7 (only).

Programs

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