Primality proof for n = 9538204373:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=142183.html>142183 is prime.</a>
<br>b^((n-1)/142183)-1 mod n = 4470685906, which is a unit, inverse 7310929661.
<p>(142183) divides n-1.
<p>(142183)^2 > n.
<p>n is prime by Pocklington's theorem.