Primality proof for n = 78797:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=19699.html>19699 is prime.</a>
<br>b^((n-1)/19699)-1 mod n = 15, which is a unit, inverse 36772.
<p>(19699) divides n-1.
<p>(19699)^2 > n.
<p>n is prime by Pocklington's theorem.