OFFSET
1,2
LINKS
Harry J. Smith, Table of n, a(n) for n = 1..1000
MATHEMATICA
Select[Range[1300], Divisible[DivisorSigma[1, EulerPhi[#]], EulerPhi[ DivisorSigma[ 1, #]]]&] (* Harvey P. Dale, Dec 15 2021 *)
PROG
(PARI) { n=0; for (m=1, 10^10, if (sigma(eulerphi(m)) % eulerphi(sigma(m)) == 0, write("b066930.txt", n++, " ", m); if (n==1000, return)) ) } \\ Harry J. Smith, Apr 08 2010
CROSSREFS
KEYWORD
nonn
AUTHOR
Benoit Cloitre, Jan 26 2002
STATUS
approved