This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 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 Cf. A007539, A227765, A227766, A227767, A227768. Sequence in context: A095854 A027268 A000388 * A267903 A280039 A216912 Adjacent sequences:  A227766 A227767 A227768 * A227770 A227771 A227772 KEYWORD nonn AUTHOR Jonathan Sondow, Jul 30 2013 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified February 21 18:45 EST 2019. Contains 320376 sequences. (Running on oeis4.)