%I A060021
%S A060021 1,1,2,2,3,3,4,4,4,5,5,5,6,6,7,6,8,7,9
%N A060021 Maximal size of a subset of any Abelian group of order n that does not 
               contain 0 and fails to span the group nontrivially.
%D A060021 J. R. Griggs, Spanning subset sums for finite Abelian groups, Discrete 
               Math., 229 (2001), 89-99.
%D A060021 J. R. Griggs (griggs(AT)math.sc.edu), personal communication, Apr 24, 
               2001.
%Y A060021 Cf. A060020.
%Y A060021 Sequence in context: A084500 A084557 A024417 this_sequence A000006 A061017 
               A088462
%Y A060021 Adjacent sequences: A060018 A060019 A060020 this_sequence A060022 A060023 
               A060024
%K A060021 nonn
%O A060021 2,3
%A A060021 N. J. A. Sloane (njas(AT)research.att.com), Mar 17 2001
%E A060021 n=21 is the first open case - it is either 7 or 8.