Primality proof for n = 5879:
Take b = 2.
b^(n-1) mod n = 1.
2939 is prime. b^((n-1)/2939)-1 mod n = 3, which is a unit, inverse 1960.
(2939) divides n-1.
(2939)^2 > n.
n is prime by Pocklington's theorem.