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257 (another Prime Pages' Curiosity) |
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Single Curio View: (Seek other curios for this number) 257 = 28 + 1, (28 + 1)2 - 2 and (((28 + 1)2 - 2)2 - 2) are prime. [Luhn]
Submitted: 2000-06-18 23:01:33; Last Modified: 2008-01-30 11:28:00.
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