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221 (another Prime Pages' Curiosity) |
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Single Curio View: (Seek other curios for this number) 221^221 + reversal(221) is prime. It is the only known number greater than 1 with this property. [Firoozbakht]
Submitted: 2009-10-13 15:55:03; Last Modified: 2009-10-13 17:55:57.
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