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

1,4

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.

Links

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

Formula

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

Example

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

Crossrefs

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

Sequence in context: A172760 A172831 A172879 * A010331 A362888 A172690

Adjacent sequences: A227763 A227764 A227765 * A227767 A227768 A227769

Keyword

nonn

Author

Jonathan Sondow, Jul 29 2013

Status

approved