OFFSET
2,1
EXAMPLE
6545 = 5*7*11*17 and 12, 14, 18, 24 all divide 6552.
PROG
(Perl) use ntheory ":all"; my $f=2; forcomposites { say $f++, " $_" if scalar(factor($_))==$f && is_quasi_carmichael($_); } 1e9; # Dana Jacobsen, Apr 27 2017
CROSSREFS
KEYWORD
nonn,more,hard
AUTHOR
Tim Johannes Ohrtmann, Mar 24 2016
EXTENSIONS
a(7) from Dana Jacobsen, Apr 04 2016
STATUS
approved