A154760 Final digit of n!! (A006882).

1, 1, 2, 3, 8, 5, 8, 5, 4, 5, 0, 5, 0, 5, 0, 5, 0, 5, 0, 5, 0, 5, 0, 5, 0, 5, 0, 5, 0, 5, 0, 5, 0, 5, 0, 5, 0, 5, 0, 5, 0, 5, 0, 5, 0, 5, 0, 5, 0, 5, 0, 5, 0, 5, 0, 5, 0, 5, 0, 5, 0, 5, 0, 5, 0, 5, 0, 5, 0, 5, 0, 5, 0, 5, 0, 5, 0, 5, 0, 5, 0, 5, 0, 5, 0, 5, 0, 5, 0, 5, 0, 5, 0, 5, 0, 5, 0, 5, 0, 5, 0, 5, 0, 5, 0, 5, 0, 5, 0, 5, 0, 5, 0, 5, 0, 5, 0, 5, 0

Offset: 0

Author

Kousaka Hideaki (kousaka(AT)d6.dion.ne.jp), Jan 15 2009

Keywords

• nonn
• base

Comments

For n>8: a(n)=0 if n is even, a(n)=5 if n is odd. - Dmitry Kamenetsky, Jan 17 2009

Examples

			The final digit of n! is 1,2,6,4,0,0,0,0,0,0,0,0,0,...
		

Programs

Mathematica

Join[Mod[Range[0,8]!!,10],PadRight[{},120,{5,0}]] (* Harvey P. Dale, Dec 16 2023 *)

Extensions

Offset corrected, more terms added by R. J. Mathar, Jan 18 2009