A136702 Final nonzero digit of n! in base 16.

1, 1, 2, 6, 8, 8, 13, 11, 8, 8, 15, 5, 12, 12, 8, 8, 8, 8, 3, 9, 4, 4, 8, 8, 12, 12, 8, 8, 14, 6, 4, 12, 8, 8, 11, 1, 4, 4, 8, 8, 4, 4, 8, 8, 2, 10, 12, 4, 12, 12, 8, 8, 2, 10, 12, 4, 14, 14, 12, 4, 7, 11, 10, 6, 8, 8, 11, 1, 4, 4, 8, 8, 4, 4, 8, 8, 10, 2, 12, 4, 4, 4, 8, 8, 6, 14, 4, 12, 2, 2, 4, 12

Offset: 0

Author

Carl R. White, Jan 16 2008

Keywords

• base
• easy
• nonn

Examples

			6! = 720 decimal = 2D0 hexadecimal, so a(6) = 13.
		

Crossrefs

Cf. A000142, A136690, A136691, A136692, A136693, A136694, A136695, A136696, A008904, A136697, A136698, A136699, A136700, A136701.

Programs

PARI

a(n) = {d = digits(n!, 16); k = #d; while (!d[k] && (k!=1), k--); d[k];} \\ Michel Marcus, Sep 21 2016