Primality proof for n = 3019:
<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 = 63, which is a unit, inverse 1821.
<p>(503) divides n-1.
<p>(503)^2 > n.
<p>n is prime by Pocklington's theorem.