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Single Curio View: (Seek other curios for this number) The smallest example of xy,xxy,xxxy all being prime is with digits x=7 and y=4. So 74=3, 774=73, 7774=773 are all primes. It is the only solution because one of three consecutive numbers x..xy is divisible by 3. [Luhn]
Submitted: 20020315 15:22:37; Last Modified: 20080130 11:28:00.
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