Primality proof for n = 38603:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=19301.html>19301 is prime.</a>
<br>b^((n-1)/19301)-1 mod n = 3, which is a unit, inverse 12868.
<p>(19301) divides n-1.
<p>(19301)^2 > n.
<p>n is prime by Pocklington's theorem.