Primality proof for n = 28336003:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=503.html>503 is prime.</a>
<br>b^((n-1)/503)-1 mod n = 19093137, which is a unit, inverse 13473206.
<p><a href=229.html>229 is prime.</a>
<br>b^((n-1)/229)-1 mod n = 11127042, which is a unit, inverse 14811932.
<p>(229 * 503) divides n-1.
<p>(229 * 503)^2 > n.
<p>n is prime by Pocklington's theorem.