A072487 a(1) = 1, a(n) = a(n-1) times largest nontrivial divisor if n is composite.

1, 2, 6, 12, 60, 180, 1260, 5040, 15120, 75600, 831600, 4989600, 64864800, 454053600, 2270268000, 18162144000, 308756448000, 2778808032000, 52797352608000, 527973526080000, 3695814682560000, 40653961508160000

Offset: 1

Author

Amarnath Murthy, Jul 13 2002

Keywords

• nonn

Comments

a(n) = n*a(n-1) if n is a prime.

Examples

			a(6)= 180 hence a(7) = 7*180 = 1260.
		

Crossrefs

Cf. A072486.

Extensions

More terms from Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Apr 25 2003