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A081805
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a(n) = n minus (largest prime power in n factorization); a(1) = 0.
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3
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0, 0, 0, 0, 0, 3, 0, 0, 0, 5, 0, 8, 0, 7, 10, 0, 0, 9, 0, 15, 14, 11, 0, 16, 0, 13, 0, 21, 0, 25, 0, 0, 22, 17, 28, 27, 0, 19, 26, 32, 0, 35, 0, 33, 36, 23, 0, 32, 0, 25, 34, 39, 0, 27, 44, 48, 38, 29, 0, 55, 0, 31, 54, 0, 52, 55, 0, 51, 46, 63, 0, 63, 0, 37, 50, 57, 66, 65, 0, 64, 0, 41, 0
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OFFSET
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1,6
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COMMENTS
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LINKS
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FORMULA
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MATHEMATICA
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f[n_] := (n - (#[[1]]^#[[2]]) & /@ {FactorInteger[n][[-1]] })[[1]]; Array[f, 80] (* Robert G. Wilson v, Aug 07 2018 *)
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PROG
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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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