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 A169935 Numbers n such that for some k>0, n*k=1 in the arithmetic defined in A169918. 2
 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 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS These would be the units if the structure formed a ring (which it does not). LINKS 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: A180484 A007602 A167620 * A193498 A239087 A095227 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

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Last modified April 20 17:54 EDT 2019. Contains 322310 sequences. (Running on oeis4.)