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A081810
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If n = p_1^e_1 * ... * p_k^e_k, p_1 < ... < p_k primes, then a(n) = Max{ p_i*e_i }.
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0
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0, 2, 3, 4, 5, 3, 7, 6, 6, 5, 11, 4, 13, 7, 5, 8, 17, 6, 19, 5, 7, 11, 23, 6, 10, 13, 9, 7, 29, 5, 31, 10, 11, 17, 7, 6, 37, 19, 13, 6, 41, 7, 43, 11, 6, 23, 47, 8, 14, 10, 17, 13, 53, 9, 11, 7, 19, 29, 59, 5, 61, 31, 7, 12, 13, 11, 67, 17, 23, 7, 71, 6, 73, 37, 10, 19, 11, 13, 79, 8, 12
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