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

Author

Leroy Quet, Dec 26 2006

Keywords

• nonn

Examples

			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).
		

Crossrefs

Cf. A069213, A126357.

Programs

Mathematica

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 *)

Extensions

Extended by Ray Chandler, Dec 29 2006