A227769 - OEIS

A227769

First (n+1)-fold perfect number divided by first n-fold perfect number, or 0 if the quotient is not an integer.

6, 20, 252, 468996, 0, 0, 0

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OFFSET

1,1

COMMENTS

The first n-fold perfect numbers are A007539 = 1, 6, 120, 30240, 14182439040, 154345556085770649600, ...

For additional comments, references, links, and crossrefs, see A007539 and A227765.

LINKS

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

FORMULA

a(n) = A007539(n+1)/A007539(n) if n < 5.

EXAMPLE

The first 4-fold and 5-fold perfect numbers are A007539(4) = 30240 and A007539(5) = 14182439040, and 14182439040/30240 = 468996 is an integer, so a(4) = 468996.

CROSSREFS

Cf. A007539, A227765, A227766, A227767, A227768.

Sequence in context: A027268 A000388 A347919 * A309454 A267903 A330825

Adjacent sequences: A227766 A227767 A227768 * A227770 A227771 A227772

KEYWORD

nonn

AUTHOR

Jonathan Sondow, Jul 30 2013

STATUS

approved