Iff is a Prime, then is a multiple of , that is
See also Fermat's Little Theorem, Wilson's Theorem Corollary, Wilson's Theorem (Gauss's Generalization)
References
Ball, W. W. R. and Coxeter, H. S. M. Mathematical Recreations and Essays, 13th ed.
New York: Dover, p. 61, 1987.
Conway, J. H. and Guy, R. K. The Book of Numbers. New York: Springer-Verlag, pp. 142-143 and 168-169, 1996.
Ore, Ø. Number Theory and Its History. New York: Dover, pp. 259-261, 1988.
Shanks, D. Solved and Unsolved Problems in Number Theory, 4th ed. New York: Chelsea, pp. 37-38, 1993.