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!)
A086340 Numbers n such that 1 + (n-1)*n*(n+1) is a square. 0
1, 3, 5, 56 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
REFERENCES
M. Lambrou, Solution to problem 2411, Crux Mathematicorum, Feb. 2000 26(1) 59-60 CMS.
LINKS
PROG
(PARI) isok(n) = issquare(1 + (n-1)*n*(n+1)) \\ Michel Marcus, Jul 27 2013
CROSSREFS
Sequence in context: A260225 A020462 A087602 * A248923 A155121 A106914
KEYWORD
fini,nonn
AUTHOR
Lekraj Beedassy, Sep 02 2003
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 February 26 22:44 EST 2024. Contains 370354 sequences. (Running on oeis4.)