A137450 A038610(n) (the LCM of the positive integers that are <= n and are coprime to n) is the a(n)-th positive integer that is coprime to n.

1, 1, 2, 2, 10, 2, 52, 53, 187, 26, 2291, 129, 25588, 2758, 4271, 22523, 678325, 28362, 11607386, 1163963, 2111498, 601221, 222671145, 12394049, 856676621, 59403427, 1983047734, 307321811, 77544004469, 57508385

Offset

1,3

Links

Table of n, a(n) for n=1..30.

Example

The positive integers that are <= 10 and are coprime to 10 are 1,3,7,9; lcm(1,3,7,9) = 63. Now the positive integers that are coprime to 10 form a sequence that begins: 1, 3, 7, 9, 11, 13, 17, 19, 21, 23, 27, 29, 31, 33, 37, 39, 41, 43, 47, 49, 51, 53, 57, 59, 61, 63, 67, 69, ...
Since 63 is the 26th of these integers, a(10) = 26.

Crossrefs

Cf. A038610.

Sequence in context: A351177 A319880 A133631 * A344998 A321415 A319692

Adjacent sequences: A137447 A137448 A137449 * A137451 A137452 A137453

Keyword

nonn

Author

Leroy Quet, Apr 18 2008

Extensions

More terms from Sean A. Irvine, Nov 15 2009

Status

approved