Primality proof for n = 879331:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=29311.html>29311 is prime.</a>
<br>b^((n-1)/29311)-1 mod n = 78672, which is a unit, inverse 247921.
<p>(29311) divides n-1.
<p>(29311)^2 > n.
<p>n is prime by Pocklington's theorem.