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!)
A054983 Composite numbers n such that sigma(n+24) = sigma(n) + 24. 1
80, 95, 119, 299, 527, 962, 1247, 1479, 1739, 2783, 4307, 4958, 5240, 6015, 7878, 8342, 10379, 11639, 16967, 20687, 21439, 29294, 34547, 36917, 49022, 51959, 54707, 59807, 76127, 97319, 153242, 181427, 203318, 203822, 213419, 363302, 423999, 494882, 582902 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
LINKS
EXAMPLE
a(1) = 80, sigma(80)+24 = 186+24 = 210 = sigma(80+24) = sigma(104) = 104+52+26+13+8+4+2+1.
MATHEMATICA
With[{nn=200000}, Select[Complement[Range[nn], Prime[Range[ PrimePi[nn]]]], DivisorSigma[1, #+24] == DivisorSigma[1, #]+24&]] (* Harvey P. Dale, Jan 12 2013 *)
CROSSREFS
Sequence in context: A294740 A069086 A119482 * A039545 A322162 A143755
KEYWORD
nonn
AUTHOR
Labos Elemer, May 29 2000
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 March 3 10:06 EST 2024. Contains 370510 sequences. (Running on oeis4.)