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A121274
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a(n) = n-th integer from among those positive integers which are coprime to (nth integer from among those positive integers which are coprime to n).
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0
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1, 2, 5, 4, 13, 6, 13, 14, 9, 10, 31, 17, 29, 14, 33, 16, 49, 18, 47, 23, 21, 22, 67, 24, 25, 36, 67, 37, 107, 30, 61, 55, 33, 34, 55, 36, 77, 38, 79, 65, 143, 53, 93, 58, 45, 61, 139, 57, 77, 76, 127, 80, 157, 65, 113, 85, 57, 72, 221, 60, 125, 62, 63, 64, 100, 79, 141, 81
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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EXAMPLE
| 6 is the 5th positive integer which is coprime to 5. (1,2,3,4,6,7,8.... is the sequence of positive integers which are coprime to 5 and 6 is the 5th such integer.) 1,5,7,11,13,17,19,... are the positive integers which are coprime to 6. 13 is the 5th of these integers, so a(5) = 13.
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CROSSREFS
| Cf. A069213.
Sequence in context: A177979 A094471 A126356 * A111681 A073122 A084410
Adjacent sequences: A121271 A121272 A121273 * A121275 A121276 A121277
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KEYWORD
| nonn
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AUTHOR
| Leroy Quet Aug 23 2006
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EXTENSIONS
| Extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Aug 29 2006
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