Primality proof for n = 752881:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=3137.html>3137 is prime.</a>
<br>b^((n-1)/3137)-1 mod n = 734443, which is a unit, inverse 156840.
<p>(3137) divides n-1.
<p>(3137)^2 > n.
<p>n is prime by Pocklington's theorem.