sfk(n)+n/sfk(n), where sfk(n) is the squarefree kernel of n = A007947(n). 2, 3, 4, 4, 6, 7, 8, 6, 6, 11, 12, 8, 14, 15, 16, 10, 18, 9, 20, 12, 22, 23, 24, 10, 10, 27
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