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A169935 Numbers n such that for some k>0, n*k=1 in the arithmetic defined in A169918. 2

%I

%S 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,

%T 51,55,56,61,62,66,67,72,73,77,78,83,84,88,89,90,94,95,99,111,112,116,

%U 117,222,223,227,228,333,334,338,339,440,444,445,449

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

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

%e 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.

%K nonn,base

%O 1,2

%A _David Applegate_, _Marc LeBrun_ and _N. J. A. Sloane_, Jul 21 2010

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Last modified May 20 02:49 EDT 2019. Contains 323412 sequences. (Running on oeis4.)