A126357 -id:A126357 - cp's OEIS frontend

A126356 a(n) is the n-th integer from among the positive integers which are coprime to (n+1).

1, 2, 5, 4, 13, 6, 13, 11, 21, 10, 31, 12, 29, 26, 29, 16, 49, 18, 47, 34, 45, 22, 67, 29, 53, 38, 61, 28, 107, 30, 61, 52, 69, 48, 103, 36, 77, 61, 97, 40, 143, 42, 93, 82, 93, 46, 139, 55, 121, 79, 109, 52, 157, 73, 127, 88, 117, 58, 221, 60, 125, 107, 125, 86, 215, 66, 141

Offset: 1

Leroy Quet, Dec 26 2006

nonn

			The positive integers which are coprime to 6 are 1,5,7,11,13,17,19,23,... The 5th of these is 13, which is a(5).

Cf. A069213, A126357.

f[n_] := Block[{k = 0, c = n},While[c > 0,k++;While[GCD[k, n + 1] > 1, k++ ];c--;];k];Table[f[n], {n, 67}] (* Ray Chandler, Dec 29 2006 *)

Extended by Ray Chandler, Dec 29 2006

A139766 A number n is included in the sequence if and only if the n-th integer from among those positive integers which are coprime to n+1 = the (n+1)-st integer from among those positive integers which are coprime to n.

Original entry on oeis.org

3, 15, 104, 164, 255, 2625, 2834, 11715, 18315, 48704, 49215, 64004, 65535, 73124, 131144, 215775, 491535, 525986, 546272, 568815, 952575, 1925564, 5781434, 5861583, 13496384, 14409548, 17646615, 17949434, 20171384, 21475124, 22632285

Offset: 1

Leroy Quet, Nov 07 2007

nonn

So far it appears that this is a proper subset of A001274.

Cf. A001274, A069213, A126356, A126357.

Indices n such that A126356(n) = A126357(n). - Ray Chandler

More terms from Stefan Steinerberger, Nov 07 2007

a(8) onwards from Ray Chandler, Jul 01 2009

cp's OEIS Frontend

A126356 a(n) is the n-th integer from among the positive integers which are coprime to (n+1).

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