OFFSET
1,1
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10000
MATHEMATICA
Select[Range[1500], Divisible[DivisorSigma[1, #+4], EulerPhi[#]+4] &] (* Amiram Eldar, Dec 25 2023 *)
PROG
(PARI) is(n)=!(sigma(n+4)%(eulerphi(n)+4)) \\ Charles R Greathouse IV, Sep 25 2012
CROSSREFS
KEYWORD
nonn
AUTHOR
EXTENSIONS
Corrected by Charles R Greathouse IV, Sep 25 2012
STATUS
approved