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A135679
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a(n) = n if n = 1 or if n is prime. Otherwise, a(n) = 2 if n is even and a(n) = 3 if n is odd.
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5
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1, 2, 3, 2, 5, 2, 7, 2, 3, 2, 11, 2, 13, 2, 3, 2, 17, 2, 19, 2, 3, 2, 23, 2, 3, 2, 3, 2, 29, 2, 31, 2, 3, 2, 3, 2, 37, 2, 3, 2, 41, 2, 43, 2, 3, 2, 47, 2, 3, 2, 3, 2, 53, 2, 3, 2, 3, 2, 59, 2, 61, 2, 3, 2, 3, 2, 67, 2, 3, 2, 71, 2, 73
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OFFSET
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1,2
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COMMENTS
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LINKS
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MATHEMATICA
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a[n_] := If[PrimeQ[n] || n == 1, n, If[EvenQ[n], 2, 3] ]; Table[a[n], {n, 1, 25}] (* G. C. Greubel, Oct 26 2016 *)
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PROG
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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