The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
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!)
A114081 sigma(n) plus the n-th prime gives a cube. 2
178, 185, 268, 548, 581, 2142, 9474, 17027, 17108, 66367, 71212, 155131, 230521, 296001, 318558, 335880, 555896, 620041, 1141190, 1158839, 1559606, 1650646, 2021877, 3274046, 3655189, 3668878, 4023383 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
EXAMPLE
sigma(155131)+p(155131)=2248091=131^3.
MATHEMATICA
Select[Range[4024000], IntegerQ[Surd[DivisorSigma[1, #]+Prime[#], 3]]&] (* Harvey P. Dale, Nov 01 2021 *)
PROG
(PARI) isok(n) = ispower(sigma(n) + prime(n), 3); \\ Michel Marcus, Jan 11 2014
CROSSREFS
Sequence in context: A189160 A053018 A046436 * A217037 A224600 A279093
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 May 21 09:41 EDT 2024. Contains 372733 sequences. (Running on oeis4.)