Primality proof for n = 51473:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=3217.html>3217 is prime.</a>
<br>b^((n-1)/3217)-1 mod n = 14062, which is a unit, inverse 36403.
<p>(3217) divides n-1.
<p>(3217)^2 > n.
<p>n is prime by Pocklington's theorem.