Primality proof for n = 70825721:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=252949.html>252949 is prime.</a>
<br>b^((n-1)/252949)-1 mod n = 10924806, which is a unit, inverse 36789724.
<p>(252949) divides n-1.
<p>(252949)^2 > n.
<p>n is prime by Pocklington's theorem.