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9 (another Prime Pages' Curiosity) |
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Single Curio View: (Seek other curios for this number) The only known composite number n such that both 2n+n2 and 2n-n2 are prime. [Poo Sung]
Submitted: 2009-06-04 05:03:27; Last Modified: 2009-09-06 13:12:10.
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