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A072487 a(1) = 1, a(n) = a(n-1) times largest nontrivial divisor if n is composite. 0
1, 2, 6, 12, 60, 180, 1260, 5040, 15120, 75600, 831600, 4989600, 64864800, 454053600, 2270268000, 18162144000, 308756448000, 2778808032000, 52797352608000, 527973526080000, 3695814682560000, 40653961508160000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

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

LINKS

Table of n, a(n) for n=1..22.

EXAMPLE

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

CROSSREFS

Cf. A072486.

Sequence in context: A104350 A220027 A072489 * A254232 A189394 A182862

Adjacent sequences:  A072484 A072485 A072486 * A072488 A072489 A072490

KEYWORD

nonn

AUTHOR

Amarnath Murthy, Jul 13 2002

EXTENSIONS

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

STATUS

approved

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Last modified October 23 21:31 EDT 2018. Contains 316541 sequences. (Running on oeis4.)