We also have a relationship to algebraic K-theory; if cn is the numerator of Bn/2n, then the order of K_{4n-2}(Bbb{Z}) is ???c2n if n is even, and 2c2n if n is odd.The Agoh-Giuga conjecture postulates that p is a prime number if and only if pBp???1 is congruent to ???1 mod p.