definition of anti-divisor

[Jonathan Post]

Any work since 2001 on whether or not there is a 6th anti-prime?  How
far has this been searched?  Any proofs or disproofs as to finiteness
of A066466?

COMMENT FROM Jonathan Vos Post RE A066466

%I A066466
%S A066466 3, 4, 6, 96, 393216
%N A066466 Numbers having just one anti-divisor.
%C A066466 Jon Perry calls these anti-prime numbers, saying that these
are the only 5 known. This sequence is worth extending, if possible,
or proving finite.
%F A066466 A066272(a(n)) = 1.
%Y A066466 Cf. A066272.
%O A066466 1
%K A066466 ,more,nonn,
%A A066466 Jonathan Vos Post (jvospost2 at yahoo.com), Jul 23 2007