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ADS98

T. Agoh, K. Dilcher and L. Skula, "Wilson quotients for composite moduli," Math. Comp., 67 (1998) 843--861.  MR 98h:11003

Abstract: An analogue for composite moduli m > 2 of the Wilson quotient is studied. Various congruences are derived, and the question of when these quotients are divisible by m is investigated; such an m will be called a "Wilson number". It is shown that numbers in certain infinite classes cannot be Wilson numbers. Eight new Wilson numbers up to 500 million were found.