Primality proof for n = 2413883:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=1206941.html>1206941 is prime.</a>
<br>b^((n-1)/1206941)-1 mod n = 3, which is a unit, inverse 804628.
<p>(1206941) divides n-1.
<p>(1206941)^2 > n.
<p>n is prime by Pocklington's theorem.