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81 (another Prime Pages' Curiosity) |
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Single Curio View: (Seek other curios for this number) 81 is the smallest (and only known) square such that 81*2^81-1 is prime. [Gupta]
Submitted: 2003-02-08 23:56:04; Last Modified: 2011-07-30 09:14:30.
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