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Just showing those entries submitted by 'Russ': (Click here to show all) Its digits are composite. Yet each digit minus 1, the sum of the digit minus 1 and the absolute value of the difference of the digits minus 1 is prime. [Russo]84 is the smallest number that can be expressed as the sum of 3 distinct primes raised to distinct prime exponents (2^{5} + 3^{3} + 5^{2}). [Russ]
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