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147 (another Prime Pages' Curiosity) |
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The product of the digits of 147 + 1 is prime. Note that the sum of digits + 1 remains prime. [Russo] 147 = 1*4*7 + 1+4+7 + prime(1*4*7). Note that 147 is the only number less than 10000000 with this property. [Firoozbakht] 147 = prime(1*4*7) + (1*4*7) + phi(1*4*7). Note that 147 is the only number less than 10000000 with this property. [Firoozbakht]
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