login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A063068 Smallest number expressible as (a^2-1)(b^2-1) in at least n distinct ways [with b>=a>1]. 6
9, 360, 2880, 241920, 588107520 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Note that each term is a multiple of the preceding term (at least up to a(5)).
LINKS
K. S. Brown, MathPages Most Wanted List Problem #14
EXAMPLE
a(4)=241920 since 241920 =(4^2-1)(127^2-1) =(7^2-1)(71^2-1) =(9^2-1)(55^2-1) =(17^2-1)(29^2-1)
CROSSREFS
Sequence in context: A266881 A119756 A222697 * A130558 A132593 A162133
KEYWORD
more,nonn
AUTHOR
Henry Bottomley, Jul 08 2001
STATUS
approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified July 22 13:14 EDT 2024. Contains 374499 sequences. (Running on oeis4.)