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Jul 12, 2010 at 6:34 comment added Gjergji Zaimi That example comes from some olympiad and while the intended (proposed) solution was with Perron's criterion, everyone in the competition solved it using Eisenstein-like criteria.
Jul 12, 2010 at 6:18 comment added Qiaochu Yuan Interesting. I've only ever seen the problem you mention solved using Perron's criterion, but that's a nice solution.
Feb 18, 2010 at 10:20 vote accept Franz Lemmermeyer
Feb 17, 2010 at 9:37 history answered Gjergji Zaimi CC BY-SA 2.5