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!)
A116025 sigma(n) plus n gives a semiprime (A001358). 1
7, 9, 14, 15, 17, 18, 19, 20, 22, 32, 39, 43, 45, 46, 47, 49, 50, 51, 59, 61, 62, 68, 70, 71, 72, 79, 81, 86, 91, 93, 95, 101, 104, 107, 109, 110, 115, 116, 117, 118, 121, 123, 129, 130, 142, 149, 151, 158, 160, 163, 164, 165, 167, 177, 185, 187, 197, 201, 207 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
EXAMPLE
sigma(101)+101=203=7*29.
MATHEMATICA
Select[Range[300], PrimeOmega[DivisorSigma[1, #]+#]==2&] (* Harvey P. Dale, May 21 2014 *)
CROSSREFS
Sequence in context: A063189 A004472 A145827 * A344011 A320325 A320699
KEYWORD
nonn
AUTHOR
Giovanni Resta, Feb 13 2006
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 20 19:11 EDT 2024. Contains 374459 sequences. (Running on oeis4.)