Primality proof for n = 4919:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=2459.html>2459 is prime.</a>
<br>b^((n-1)/2459)-1 mod n = 3, which is a unit, inverse 1640.
<p>(2459) divides n-1.
<p>(2459)^2 > n.
<p>n is prime by Pocklington's theorem.