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A073481
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Least prime factor of the n-th squarefree number.
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8
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1, 2, 3, 5, 2, 7, 2, 11, 13, 2, 3, 17, 19, 3, 2, 23, 2, 29, 2, 31, 3, 2, 5, 37, 2, 3, 41, 2, 43, 2, 47, 3, 53, 5, 3, 2, 59, 61, 2, 5, 2, 67, 3, 2, 71, 73, 2, 7, 2, 79, 2, 83, 5, 2, 3, 89, 7, 3, 2, 5, 97, 101, 2, 103, 3, 2, 107, 109, 2, 3, 113, 2, 5, 2, 7, 2, 3, 127, 3, 2, 131, 7, 2, 137, 2, 139, 3, 2, 11, 5
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OFFSET
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1,2
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LINKS
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FORMULA
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MATHEMATICA
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PROG
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(Haskell)
(PARI) apply(x->(if (x==1, 1, vecmin(factor(x)[, 1]))), select(issquarefree, [1..150])) \\ Michel Marcus, Dec 17 2023
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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