Primality proof for n = 674750394557:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=24098228377.html>24098228377 is prime.</a>
<br>b^((n-1)/24098228377)-1 mod n = 268435455, which is a unit, inverse 430257804336.
<p>(24098228377) divides n-1.
<p>(24098228377)^2 > n.
<p>n is prime by Pocklington's theorem.