A169935 Numbers n such that for some k>0, n*k=1 in the arithmetic defined in A169918.

1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 16, 17, 22, 23, 27, 28, 33, 34, 38, 39, 40, 44, 45, 49, 50, 51, 55, 56, 61, 62, 66, 67, 72, 73, 77, 78, 83, 84, 88, 89, 90, 94, 95, 99, 111, 112, 116, 117, 222, 223, 227, 228, 333, 334, 338, 339, 440, 444, 445, 449

Offset: 1

Author

David Applegate, Marc LeBrun and N. J. A. Sloane, Jul 21 2010

Keywords

• nonn
• base

Comments

These would be the units if the structure formed a ring (which it does not).

Examples

			22 is a member since 22*88 = 1. So is 23 since 23*8 = 1. 10 is not a member, even though 10 divides 9, since 10*9 = 0.