A227766 First n-fold perfect number divided by 120, or 0 if the quotient is not an integer.

0, 0, 1, 252, 118186992, 1286212967381422080, 1177590816228652902165411689487379360536196206821376000

Offset: 1

Author

Jonathan Sondow, Jul 29 2013

Keywords

• nonn

Comments

The first n-fold perfect numbers are A007539(n) = 1, 6, 120, 30240, 14182439040, ..., for n = 1, 2, 3, 4, 5, ...

For additional comments, references, links, and cross-refs, see A007539 and A227765.

Examples

			The first 4-fold perfect number is A007539(4) = 30240, so a(4) = 30240/120 = 252.
		

Links

• T. D. Noe, Table of n, a(n) for n = 1..8

Crossrefs

Cf. A007539, A227765, A227767, A227768, A227769.

Formula

a(n) = A007539(n)/120 if 3 <= n <= 8.