A251483 Position of first occurrence of n in A036459.

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

Offset

0,2

Links

Table of n, a(n) for n=0..8.

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

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

Sequence in context: A006719 A202855 A182857 * A009287 A061080 A254049

Adjacent sequences: A251480 A251481 A251482 * A251484 A251485 A251486

Keyword

nonn

Author

Ivan Neretin, Mar 29 2015

Status

approved