An inquiry into whether or not 1000009 is a prime number

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http://arxiv.org/abs/math/0412062"
 
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It's nice to see translations of classic papers.
 
In point 2, what prevents x from being congruent to -3, instead of 3 (mod 25) ?
 
1000009 is not prime. It is divisible by 293. lol
 

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