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A090127
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Distinct values of phi(n) in order of appearance as n increases.
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4
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1, 2, 4, 6, 10, 12, 8, 16, 18, 22, 20, 28, 30, 24, 36, 40, 42, 46, 32, 52, 58, 60, 48, 66, 44, 70, 72, 78, 54, 82, 64, 56, 88, 96, 100, 102, 106, 108, 112, 110, 80, 126, 84, 130, 136, 138, 92, 120, 148, 150, 156, 104, 132, 162, 166, 172, 116, 178, 180, 144, 160, 190, 192
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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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t=Table[EulerPhi[w], {w, 1, 100}] s=Sort[t]; u=Union[t]; Length[u] Table[Count[s, Part[u, j]], {j, 1, Length[u]}] g=Table[Min[Flatten[Position[t, Part[u, j]]]], {j, 1, Length[u]}]; uu=Union[g]; Table[Part[t, Part[uu, j]], {j, 1, Length[g]}]
DeleteDuplicates[EulerPhi[Range[200]]] (* Harvey P. Dale, Jan 20 2013 *)
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PROG
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(Haskell)
a090127 n = a090127_list !! (n-1)
a090127_list = f a000010_list [] where
f (x:xs) phis | x `elem` phis = f xs phis
| otherwise = x : f xs (x : phis)
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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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