A139771 Exponents of prime factorization are factorial numbers in descending order.

1, 2, 6, 60, 20160, 23543886643200, 41101884684637603112076605638990269409595309948928000000

Offset

1,2

Links

Table of n, a(n) for n=1..7.

Formula

a(n) = 2^(n!) * 3^((n-1)!) * 5^((n-2)!) * ... * p(n+1)^(0!);

Example

a(4) = (2^6)(3^2)(5)(7) = 20160

Prog

J Program
*/ @ (p: ^ (!@|.)) @ i.

Crossrefs

Sequence in context: A156503 A077175 * A129665 A173606 A134706 A145756

Adjacent sequences: A139768 A139769 A139770 * A139772 A139773 A139774

Keyword

easy,nonn

Author

Dan Brown (dbrown(AT)certicom.com), May 20 2008

Status

approved