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A126601
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a(n) = n-th composite from among those composites which are coprime to n.
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0
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4, 15, 10, 25, 12, 77, 15, 39, 26, 69, 20, 121, 22, 81, 56, 69, 27, 161, 30, 121, 65, 105, 35, 205, 49, 119, 68, 141, 44, 391, 46, 123, 92, 141, 81, 287, 54, 153, 106, 213, 58, 425, 62, 185, 146, 177, 66, 343, 82, 259, 128, 209, 75, 385, 114, 253, 142, 215, 82, 671, 85
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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EXAMPLE
| The composites which are coprime to 6 are: 25,35,49,55,65,77,85,...So a(6) is the 6th of these, which is 77.
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MATHEMATICA
| f[n_] := Block[{k = 1, c = n}, While[c > 0, k++; While[PrimeQ[k] || GCD[k, n] > 1, k++ ]; c--; ]; k]; Table[f[n], {n, 61}] (*Chandler*)
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CROSSREFS
| Sequence in context: A024547 A143899 A154068 * A095331 A163773 A076349
Adjacent sequences: A126598 A126599 A126600 * A126602 A126603 A126604
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KEYWORD
| nonn
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AUTHOR
| Leroy Quet Jan 06 2007
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EXTENSIONS
| Extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Jan 08 2007
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