Primality proof for n = 904340159:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=68521.html>68521 is prime.</a>
<br>b^((n-1)/68521)-1 mod n = 707758818, which is a unit, inverse 296071965.
<p>(68521) divides n-1.
<p>(68521)^2 > n.
<p>n is prime by Pocklington's theorem.