Primality proof for n = 522528103:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=21143.html>21143 is prime.</a>
<br>b^((n-1)/21143)-1 mod n = 196245148, which is a unit, inverse 504004310.
<p><a href=1373.html>1373 is prime.</a>
<br>b^((n-1)/1373)-1 mod n = 880858, which is a unit, inverse 344921177.
<p>(1373 * 21143) divides n-1.
<p>(1373 * 21143)^2 > n.
<p>n is prime by Pocklington's theorem.