Carmichael Number - Article in Eric Weisstein's MathWorld. mathworld.wolfram.com/CarmichaelNumber.html
Carmichael Numbers and the Miller-Rabin Test - A worksheet from Professor Alexandre Borovik containing practical examples where Fermat probable primality fails to identify composites, yet strong probable primality can resolve. www.ma.umist.ac.uk/avb/117ws9.html