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Check divisibility (Posted on 2015-09-16) Difficulty: 3 of 5
Find all prime numbers p for which number p^2 +11 has exactly six distinct divisors (counting 1 and itself).

See The Solution Submitted by Ady TZIDON    
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re(2): computer exploration (probable spoiler) | Comment 4 of 5 |
(In reply to re: computer exploration (probable spoiler) by Ady TZIDON)

I could have sworn I had written " = 3" in that sentence.  Well I've added it now.



  Posted by Charlie on 2015-09-17 07:47:38
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