[devarajkandadai]

A CONJECTURE

Let N = p1p2....pr

The necessary and sufficient condition for N, an r-factor composite number,
to be a Carmichael Number:

(p1-1)(N-1)^(r-2)/ (p2-1)(P3-1)....(pr-1),

(p2-1)(N-1)^(r-2)/ (p1-1)(p3-1)... (pr-1),
.
.

.

(pr-1)(N-1)^(r-2)/(p1-1)......... (p(r-1)-1)

should ALL be integers.

A.K. Devaraj