Primality proof for n = 235251347:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=972113.html>972113 is prime.</a>
<br>b^((n-1)/972113)-1 mod n = 196216934, which is a unit, inverse 80765271.
<p>(972113) divides n-1.
<p>(972113)^2 > n.
<p>n is prime by Pocklington's theorem.