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%I #17 Sep 13 2015 04:59:27
%S 1,1,3,12,20160
%N List of orders of alternating groups which are unit groups of rings.
%C The groups in question are A_1, A_2, A_3, A-4 and A_8.
%C The rings are assumed to be associative and to have a unit element.
%C The analogous sequence when we consider symmetric groups is S_1, S_2, S_3 and S_4.
%H Christopher Davis, Tommy Occhipinti, <a href="http://dx.doi.org/10.1142/S0219498813501144">Which alternating and symmetric groups are unit groups?</a>, J. Algebra Appl., 13 (2014), no. 3, 1350114, 12 pp. MR3125882. [The source for this sequence]
%Y Cf. A001710, A239892.
%K nonn,fini,full
%O 1,3
%A _N. J. A. Sloane_, Apr 03 2014