login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A227768 First n-fold perfect number divided by 14182439040, or 0 if the quotient is not an integer. 6
0, 0, 0, 0, 1, 0, 9963793783910270786529635084437882643939328000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

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)/14182439040 for n = 5, 7, 8.

EXAMPLE

The first 6-fold perfect number is A007539(6) = 154345556085770649600, and 154345556085770649600/14182439040 = 119711504640/11 is not an integer, so a(6) = 0.

CROSSREFS

Cf. A007539, A227765, A227766, A227767, A227769.

Sequence in context: A160678 A095484 A272522 * A095486 A095488 A292858

Adjacent sequences:  A227765 A227766 A227767 * A227769 A227770 A227771

KEYWORD

nonn

AUTHOR

Jonathan Sondow, Jul 29 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.

License Agreements, Terms of Use, Privacy Policy. .

Last modified June 12 22:22 EDT 2021. Contains 344972 sequences. (Running on oeis4.)