Primality proof for n = 198280883:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=99140441.html>99140441 is prime.</a>
<br>b^((n-1)/99140441)-1 mod n = 3, which is a unit, inverse 66093628.
<p>(99140441) divides n-1.
<p>(99140441)^2 > n.
<p>n is prime by Pocklington's theorem.