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A227769 First (n+1)-fold perfect number divided by first n-fold perfect number, or 0 if the quotient is not an integer. 5
6, 20, 252, 468996, 0, 0, 0 (list; graph; refs; listen; history; text; internal format)
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
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
Sequence in context: A027268 A000388 A347919 * A309454 A267903 A330825
KEYWORD
nonn
AUTHOR
Jonathan Sondow, Jul 30 2013
STATUS
approved

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Last modified March 29 02:23 EDT 2024. Contains 371264 sequences. (Running on oeis4.)