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EXAMPLE
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The integer partitions of 3 are {(3), (2,1), (1,1,1)}, with Heinz numbers {5,6,8}, with product 240, so a(3) = 240.
The sequence of terms together with their prime indices begins:
1: {}
2: {1}
12: {1,1,2}
240: {1,1,1,1,2,3}
120960: {1,1,1,1,1,1,1,2,2,2,3,4}
638668800: {1,1,1,1,1,1,1,1,1,1,1,1,2,2,2,2,3,3,4,5}
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