Primality proof for n = 78591707:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=39295853.html>39295853 is prime.</a>
<br>b^((n-1)/39295853)-1 mod n = 3, which is a unit, inverse 26197236.
<p>(39295853) divides n-1.
<p>(39295853)^2 > n.
<p>n is prime by Pocklington's theorem.