Primality proof for n = 7523:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=3761.html>3761 is prime.</a>
<br>b^((n-1)/3761)-1 mod n = 3, which is a unit, inverse 2508.
<p>(3761) divides n-1.
<p>(3761)^2 > n.
<p>n is prime by Pocklington's theorem.