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9 (another Prime Pages' Curiosity) |
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Single Curio View: (Seek other curios for this number) 19, 109, 1009 and 10009 are primes. No other digit can replace the 9 and yield four primes. [Friend]
Submitted: 2003-02-12 21:50:03; Last Modified: 2008-01-30 11:28:00.
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