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

Author

Leroy Quet, Apr 18 2008

Keywords

• nonn

Examples

			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.

Extensions

More terms from Sean A. Irvine, Nov 15 2009