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1391 (another Prime Pages' Curiosity) |
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Single Curio View: (Seek other curios for this number) 1391 is the smallest composite number ending in 1, 3, 7, or 9 that cannot be made prime by adding any multiple of 100 up to a thousand.
Submitted: 2004-03-26 17:09:08; Last Modified: 2008-01-30 11:28:00.
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