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317 (another Prime Pages' Curiosity) |
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Single Curio View: (Seek other curios for this number) The number of ones that form the fourth repunit prime. It was first proven prime by Hugh C. Williams in 1977. [Dobb]
Submitted: 1999-09-02 18:40:00; Last Modified: 2009-03-19 20:13:09.
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