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%I M2527 #26 Jan 15 2021 16:48:43
%S 1,3,6,9,13,17,24,30,36,42
%N Modular postage stamp problem: largest m such that there exists an n-subset S of nonnegative integers such that 0,...,m-1 can be expressed as a mod-m sum of two distinct elements of S.
%D P. Frankl et al., Projecting a finite point-set into a hyperplane, Ryukyu Math. J. 8 (1995), 27-35.
%D N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
%H R. L. Graham and N. J. A. Sloane, <a href="http://neilsloane.com/doc/RLG/073.pdf">On Additive Bases and Harmonious Graphs</a>, SIAM J. Algebraic and Discrete Methods, 1 (1980), 382-404.
%H Sean A. Irvine, <a href="/A004131/a004131.txt">Example sets for a(2) to a(11)</a>
%K nonn
%O 2,2
%A _N. J. A. Sloane_
%E a(11) from _Sean A. Irvine_, Dec 07 2015
%E Definition edited by _Rob Pratt_, Jan 15 2021
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