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A {6, 2, 2, 2, 16, 2} B {37, 37, 3, 3, 3, ?}

The numbers in set A relate to one another through a numerical or abstract pattern. Set B has a similar or a somewhat contrasting pattern .The task in this short but hard puzzle is to identify the logic and complete the incomplete set.

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This may be far too simple but:

3?

Reasoning:

6 least prime factor is 2 2 least prime factor is 2 etc... Since list B is all prime, only prime numbers are returned

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