Primality proof for n = 49481:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=1237.html>1237 is prime.</a>
<br>b^((n-1)/1237)-1 mod n = 17090, which is a unit, inverse 30369.
<p>(1237) divides n-1.
<p>(1237)^2 > n.
<p>n is prime by Pocklington's theorem.