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A Wilson prime is a prime satisfying W(p)=0 (mod p), where W(p) is the Wilson quotient, or equivalently, (p-1)!=-1 (mod p^2). The first few Wilson primes are 5, 13, and 563 ...

The absolute difference of two numbers n_1 and n_2 is |n_1-n_2|, where the minus sign denotes subtraction and |x| denotes the absolute value.

A mathematical object S is said to be additively closed if a,b in S implies that a+b in S.

The first of several addends, or "the one to which the others are added," is sometimes called the augend. Therefore, while a, b, and c are addends in a+b+c, a is the augend.

The procedure used in subtraction to "borrow" 10 from the next higher digit column in order to obtain a positive difference in the column in question.

Solve the Pell equation x^2-92y^2=1 in integers. The smallest solution is x=1151, y=120.

The value of b, where a=b (mod m), taken to be nonnegative and smaller than m.

A group of sociable numbers of order 3.

A sequence {a_1,a_2,...} for which a_1>=a_2>=....

The difference of two numbers n_1 and n_2 is n_1-n_2, where the minus sign denotes subtraction.