Primality proof for n = 73965767:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=5283269.html>5283269 is prime.</a>
<br>b^((n-1)/5283269)-1 mod n = 16383, which is a unit, inverse 27838181.
<p>(5283269) divides n-1.
<p>(5283269)^2 > n.
<p>n is prime by Pocklington's theorem.