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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A033881 Abundancy of n-th abundant number: sigma(k)-2k if this is >0. 1
4, 3, 2, 12, 12, 19, 10, 12, 28, 12, 8, 48, 12, 4, 51, 12, 26, 56, 4, 54, 60, 17, 12, 2, 64, 24, 12, 120, 60, 72, 12, 56, 115, 72, 80, 58, 39, 144, 12, 20, 186, 12, 124, 7, 72, 65, 96, 18, 156, 168, 64, 12, 56, 104, 78, 264, 12, 224, 12, 68, 192, 180, 14, 120, 160, 12, 243 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..67.

MAPLE

with(numtheory): for n from 2 to 500 do if sigma(n) - 2*n > 0 then printf(`%d, `, sigma(n) - 2*n) fi: od:

CROSSREFS

Sequence in context: A062111 A181596 A182142 * A099406 A274601 A202696

Adjacent sequences:  A033878 A033879 A033880 * A033882 A033883 A033884

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

EXTENSIONS

More terms from James A. Sellers, Feb 19 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 | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified June 28 16:43 EDT 2017. Contains 288839 sequences.