Primality proof for n = 78364019:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=19273.html>19273 is prime.</a>
<br>b^((n-1)/19273)-1 mod n = 5524527, which is a unit, inverse 63176552.
<p>(19273) divides n-1.
<p>(19273)^2 > n.
<p>n is prime by Pocklington's theorem.