Primality proof for n = 2749283:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=1013.html>1013 is prime.</a>
<br>b^((n-1)/1013)-1 mod n = 2192408, which is a unit, inverse 1111794.
<p><a href=59.html>59 is prime.</a>
<br>b^((n-1)/59)-1 mod n = 2489823, which is a unit, inverse 1578692.
<p>(59 * 1013) divides n-1.
<p>(59 * 1013)^2 > n.
<p>n is prime by Pocklington's theorem.