Difference between n and the sum of its divisors except 1 and itself. 2, 3, 2, 5, 1, 7, 2, 6, 3, 11, 3, 13, 5, 7, 2, 17, 2, 19, 1, 11, 9, 23, 11, 20, 11, 15, 1
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