Primality proof for n = 151883:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=75941.html>75941 is prime.</a>
<br>b^((n-1)/75941)-1 mod n = 3, which is a unit, inverse 50628.
<p>(75941) divides n-1.
<p>(75941)^2 > n.
<p>n is prime by Pocklington's theorem.