A181579 Smallest number m such that m! ends in exactly n trailing 0's (or 0 if no such m exists).

0, 5, 10, 15, 20, 0, 25, 30, 35, 40, 45, 0, 50, 55, 60, 65, 70, 0, 75, 80, 85, 90, 95, 0, 100, 105, 110, 115, 120, 0, 0, 125, 130, 135, 140, 145, 0, 150, 155, 160, 165, 170, 0, 175, 180, 185, 190, 195, 0, 200, 205, 210, 215, 220, 0, 225, 230, 235, 240, 245, 0, 0, 250

Offset: 0

Author

Lekraj Beedassy, Nov 02 2010

Keywords

• nonn

Comments

The sequence locates the first occurrence of n in A027868.

Entries are zero if n is an element of A000966.

Crossrefs

Cf. A181578

Formula

a(n) = 5*A181578(n).