Primality proof for n = 7293089:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=20719.html>20719 is prime.</a>
<br>b^((n-1)/20719)-1 mod n = 3539901, which is a unit, inverse 6833422.
<p>(20719) divides n-1.
<p>(20719)^2 > n.
<p>n is prime by Pocklington's theorem.