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A120841 a(n) = the n-th positive integer which is coprime to the number of positive divisors of n. 1
1, 3, 5, 5, 9, 11, 13, 15, 13, 19, 21, 35, 25, 27, 29, 19, 33, 53, 37, 59, 41, 43, 45, 47, 37, 51, 53, 83, 57, 59, 61, 95, 65, 67, 69, 53, 73, 75, 77, 79, 81, 83, 85, 131, 133, 91, 93, 119, 73, 149, 101, 155, 105, 107, 109, 111, 113, 115, 117, 179, 121, 123, 187, 74, 129 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..65.

EXAMPLE

12 has 6 positive divisors. 1,5,7,11,13,17,19,23,25,29,31,35,37,...is the sequence of positive integers which are coprime to 6. 35 is the 12th of these integers, so a(12) = 35.

CROSSREFS

Cf. A000005.

Sequence in context: A212631 A090792 A076877 * A145282 A049757 A190864

Adjacent sequences:  A120838 A120839 A120840 * A120842 A120843 A120844

KEYWORD

nonn

AUTHOR

Leroy Quet, Aug 18 2006

EXTENSIONS

Extended by Ray Chandler, Aug 22 2006

STATUS

approved

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Last modified November 21 16:04 EST 2019. Contains 329371 sequences. (Running on oeis4.)