Primality proof for n = 5121119:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=6977.html>6977 is prime.</a>
<br>b^((n-1)/6977)-1 mod n = 969211, which is a unit, inverse 2762657.
<p>(6977) divides n-1.
<p>(6977)^2 > n.
<p>n is prime by Pocklington's theorem.