Primality proof for n = 716223737:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=5266351.html>5266351 is prime.</a>
<br>b^((n-1)/5266351)-1 mod n = 618493942, which is a unit, inverse 424902569.
<p>(5266351) divides n-1.
<p>(5266351)^2 > n.
<p>n is prime by Pocklington's theorem.