login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A109510 Values of n such that sigma(n)-2n (the abundance of n) is a (positive) square. 1
6, 12, 28, 70, 88, 108, 168, 220, 348, 496, 550, 580, 726, 748, 798, 910, 918, 952, 1032, 1120, 1200, 1240, 1504, 1644, 1672, 1840, 1888, 2140, 2205, 2392, 2470, 2472, 2814, 3190, 3222, 3580, 3804, 4030, 4648, 4732, 4758, 5032, 5670, 5830 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..44.

Eric Weisstein's World of Mathematics, Abundance

CROSSREFS

Sequence in context: A183026 A146005 A223346 * A034715 A079390 A124679

Adjacent sequences:  A109507 A109508 A109509 * A109511 A109512 A109513

KEYWORD

nonn

AUTHOR

Eric W. Weisstein, Jun 30 2005

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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified May 25 04:36 EDT 2017. Contains 287008 sequences.