Primality proof for n = 18413:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=4603.html>4603 is prime.</a>
<br>b^((n-1)/4603)-1 mod n = 15, which is a unit, inverse 15958.
<p>(4603) divides n-1.
<p>(4603)^2 > n.
<p>n is prime by Pocklington's theorem.