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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

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OFFSET

1,2

COMMENTS

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

LINKS

Table of n, a(n) for n=1..61.

EXAMPLE

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.

CROSSREFS

Sequence in context: A343681 A337941 A167620 * A193498 A361181 A239087

Adjacent sequences: A169932 A169933 A169934 * A169936 A169937 A169938

KEYWORD

nonn,base

AUTHOR

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

STATUS

approved

URL: https://oeis.org/A169935

⇱ A169935 - OEIS