Primality proof for n = 76031689039:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=119611.html>119611 is prime.</a>
<br>b^((n-1)/119611)-1 mod n = 42573396014, which is a unit, inverse 68677618170.
<p><a href=105943.html>105943 is prime.</a>
<br>b^((n-1)/105943)-1 mod n = 40157199381, which is a unit, inverse 27813492411.
<p>(105943 * 119611) divides n-1.
<p>(105943 * 119611)^2 > n.
<p>n is prime by Pocklington's theorem.