Primality proof for n = 11783:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=137.html>137 is prime.</a>
<br>b^((n-1)/137)-1 mod n = 1539, which is a unit, inverse 11538.
<p>(137) divides n-1.
<p>(137)^2 > n.
<p>n is prime by Pocklington's theorem.