OFFSET
2,1
REFERENCES
H. Haanpaa, Minimum sum and difference covers of abelian groups. J. Integer Seq. 7 (2004), no. 2, Article 04.2.6, 10 pp.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
LINKS
Bela Bajnok, Additive Combinatorics: A Menu of Research Problems, arXiv:1705.07444 [math.NT], May 2017. See p. 136.
R. L. Graham and N. J. A. Sloane, On Additive Bases and Harmonious Graphs
R. L. Graham and N. J. A. Sloane, On Additive Bases and Harmonious Graphs, SIAM J. Algebraic and Discrete Methods, 1 (1980), 382-404.
Sean A. Irvine, Example sets for a(2) to a(10)
CROSSREFS
KEYWORD
nonn,more
AUTHOR
EXTENSIONS
a(10) from Sean A. Irvine, Dec 07 2015
STATUS
approved