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First (n+1)-fold perfect number divided by first n-fold perfect number, or 0 if the quotient is not an integer.
5

%I #7 Jul 30 2013 15:13:21

%S 6,20,252,468996,0,0,0

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

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

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

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

%e 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.

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

%K nonn

%O 1,1

%A _Jonathan Sondow_, Jul 30 2013