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A081811
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If n = p_1^e_1 * ... * p_k^e_k, p_1 < ... < p_k primes, then a(n) = min{ p_i*e_i }.
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3
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0, 2, 3, 4, 5, 2, 7, 6, 6, 2, 11, 3, 13, 2, 3, 8, 17, 2, 19, 4, 3, 2, 23, 3, 10, 2, 9, 4, 29, 2, 31, 10, 3, 2, 5, 4, 37, 2, 3, 5, 41, 2, 43, 4, 5, 2, 47, 3, 14, 2, 3, 4, 53, 2, 5, 6, 3, 2, 59, 3, 61, 2, 6, 12, 5, 2, 67, 4, 3, 2, 71, 6, 73, 2, 3, 4, 7, 2, 79, 5, 12, 2, 83, 3, 5, 2, 3, 6, 89, 2, 7, 4, 3
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OFFSET
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1,2
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LINKS
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MAPLE
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a:= n-> `if`(n=1, 0, min(seq(i[1]*i[2], i=ifactors(n)[2]))):
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PROG
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(PARI) a(n)=local(f); if(n==1, 0, f=factor(n); vecmin(vector(matsize(f)[1], k, f[k, 1]*f[k, 2])))
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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