Primality proof for n = 387610748845807843:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=3462603391451.html>3462603391451 is prime.</a>
<br>b^((n-1)/3462603391451)-1 mod n = 95092123335069277, which is a unit, inverse 64717415888666420.
<p>(3462603391451) divides n-1.
<p>(3462603391451)^2 > n.
<p>n is prime by Pocklington's theorem.