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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. 0
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 (list; graph; refs; listen; history; text; internal format)
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: A297793 A319880 A133631 * A321415 A319692 A308693

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

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Last modified January 21 02:53 EST 2021. Contains 340332 sequences. (Running on oeis4.)