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Old 2014-08-01, 14:03   #4
CRGreathouse
 
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Quote:
Originally Posted by Batalov View Post
20154 + 4*x4 is reducible, though...
Perfect! That's why I love this forum.

Quote:
Originally Posted by axn View Post
Yes. Looks like Aurifeuillean Factorization is at play. The 405-digit unfactored part and it's cofactor are very close together in size.

That still leaves the question of why one of the cofactors split further into so many.
Indeed.
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