OFFSET
1,1
MATHEMATICA
Select[Range[1400], Divisible[DivisorSigma[1, #+6], EulerPhi[#]+6]&] (* Harvey P. Dale, Mar 06 2019 *)
PROG
(PARI) is(n)=!(sigma(n+6)%(eulerphi(n)+6)) \\ Charles R Greathouse IV, Sep 25 2012
CROSSREFS
KEYWORD
nonn
AUTHOR
EXTENSIONS
Corrected by Charles R Greathouse IV, Sep 25 2012
STATUS
approved