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654781329 (another Prime Pages' Curiosity) |
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654781329 = 3^2 x 72753481 is the only integer with just two distinct prime factors, which is also
"penholodigital" (using each nonzero digit once and only
once) and whose reversal is a square: 923187456 = 2^8 x 3^4
x 211^2 = 30384^2. [Post]
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