http://thehackernews.com/2016/10/nsa-crack-encryption.html?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+TheHackersNews+%28The+Hackers+News+-+Security+Blog%29&_m=3n.009a.1343.bx0ao08q8s.scz
my guess is, that assuming N1 x N2 requires x amount of digits, they were able to eliminate numbers with too few digits or; possibly even with too many.
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