Primality proof for n = 137849:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=17231.html>17231 is prime.</a>
<br>b^((n-1)/17231)-1 mod n = 255, which is a unit, inverse 89737.
<p>(17231) divides n-1.
<p>(17231)^2 > n.
<p>n is prime by Pocklington's theorem.