This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A288583 #19 Jul 27 2021 12:29:13 %S A288583 1,2,3,6,11,19,28,42,56 %N A288583 Related to study of weak Sidon sets. %C A288583 From _Bernd Mulansky_, Jun 23 2021: (Start) %C A288583 Additive bases: a(n) is the least integer k such that in each cyclic group Z_j with j>=k there is a subset of n elements all pairs (of distinct elements) of which add up to a different sum (in Z_j). %C A288583 Such subsets are known as (modular) weak Sidon sets, weak B_2 sets, or well-spread sequences. %C A288583 (End) %D A288583 Bela Bajnok, Additive Combinatorics: A Menu of Research Problems. Chapman & Hall/CRC, 2018. See Problem C.65. %D A288583 A. Maturo and D. Yager-Elorriaga, Finding Sidon sets in abelian groups. Research Papers in Mathematics, B. Bajnok, ed., Gettysburg College, Vol. 7 (2008). %H A288583 Bela Bajnok, <a href="https://arxiv.org/abs/1705.07444">Additive Combinatorics: A Menu of Research Problems</a>, arXiv:1705.07444 [math.NT], 2017. See Problem C.65 p. 166. %e A288583 Z_j contains a weak Sidon set of size 8 for j=40 and for every j>=42, but not for j=41, hence a(8)=42. %Y A288583 Cf. A004135. %K A288583 nonn,more %O A288583 1,2 %A A288583 _N. J. A. Sloane_, Jul 06 2017