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Count down from the nontrivial cube digit to get this the
largest prime factor: 87654321 = 3^2 * 1997 * 4877. Add
those prime factors and a 3rd of the smallest factor to get
another prime: 3 + 3 + 3 + 1997 + 4877 = 6883. Concatenate
a 4th of the smallest factor and get another prime:
333319974877. [Post]
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