Primality proof for n = 25396537147:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=4232756191.html>4232756191 is prime.</a>
<br>b^((n-1)/4232756191)-1 mod n = 63, which is a unit, inverse 23784058598.
<p>(4232756191) divides n-1.
<p>(4232756191)^2 > n.
<p>n is prime by Pocklington's theorem.