Primality proof for n = 4232756191:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=1423.html>1423 is prime.</a>
<br>b^((n-1)/1423)-1 mod n = 2133709772, which is a unit, inverse 515704736.
<p><a href=263.html>263 is prime.</a>
<br>b^((n-1)/263)-1 mod n = 547850884, which is a unit, inverse 3199132789.
<p>(263 * 1423) divides n-1.
<p>(263 * 1423)^2 > n.
<p>n is prime by Pocklington's theorem.