A161889 a(1)=2. a(n) = the smallest integer > a(n-1) that is coprime to n, and is such that (a(n)-a(n-1)) is not a divisor of n.

2, 5, 7, 13, 16, 23, 25, 31, 35, 39, 41, 49, 51, 55, 59, 65, 67, 71, 73, 79, 83, 87, 89, 103, 106, 109, 113, 121, 123, 127, 129, 135, 137, 141, 143, 151, 153, 157, 161, 167, 169, 173, 175, 181, 187, 191, 193, 203, 205, 209, 211, 217, 219, 223, 226, 229, 233, 237

Offset: 1

Author

Leroy Quet, Jun 21 2009

Keywords

• nonn

Comments

a(n) - a(n-1) = A161888(n).

Crossrefs

Cf. A161888

Extensions

More terms from Sean A. Irvine, Aug 05 2010