OFFSET
1,2
LINKS
Harry J. Smith, Table of n, a(n) for n = 1..1000
MATHEMATICA
Select[Range[200], Divisible[# DivisorSigma[1, #], EulerPhi[#]]&] (* Harvey P. Dale, Aug 23 2019 *)
PROG
(PARI) { n=0; for (m=1, 10^10, if ((m*sigma(m)) % eulerphi(m) == 0 , write("b066994.txt", n++, " ", m); if (n==1000, return)) ) } \\ Harry J. Smith, Apr 23 2010
CROSSREFS
KEYWORD
nonn
AUTHOR
Benoit Cloitre, Jan 27 2002
EXTENSIONS
Missing term a(7)=10 added by Harry J. Smith, Apr 23 2010
STATUS
approved