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A120842
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a(n) = the (number of positive divisors of n)th positive integer which is coprime to n.
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0
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1, 3, 2, 5, 2, 11, 2, 7, 4, 9, 2, 17, 2, 9, 7, 9, 2, 17, 2, 13, 5, 7, 2, 23, 3, 7, 5, 13, 2, 29, 2, 11, 5, 7, 4, 25, 2, 7, 5, 19, 2, 25, 2, 13, 11, 7, 2, 29, 3, 13, 5, 11, 2, 23, 4, 17, 5, 7, 2, 43, 2, 7, 10, 13, 4, 25, 2, 11, 5, 23, 2, 35, 2, 7, 11, 11, 4, 25, 2, 23, 7, 7, 2, 41, 4, 7, 5, 17, 2
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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EXAMPLE
| 12 has 6 positive divisors. 1,5,7,11,13,17,19,23,25...is the sequence of positive integers which are coprime to 12. 17 is the 6th of these integers, so a(12) = 17.
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CROSSREFS
| Cf. A000005.
Sequence in context: A124219 A103833 A046227 * A152178 A103340 A106615
Adjacent sequences: A120839 A120840 A120841 * A120843 A120844 A120845
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KEYWORD
| nonn
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AUTHOR
| Leroy Quet Aug 18 2006
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EXTENSIONS
| Extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Aug 22 2006
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