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 A005049 #31 Jul 01 2018 14:47:16 %S A005049 5,6,7,8,10,11,12,13,15,16,17,18,23,24,26,27,28,30,32,33,35,36,37,38, %T A005049 40,41,42,43,48,50,51,53,55,56,57,58,60,61,62,63,65,66,67,68,75,76,77, %U A005049 78,80,81,82,83,85,86,87,88,90,91,92,93,104,108,112 %N A005049 Minimal span of set of n elements with no 5-term arithmetic progression. %C A005049 If the first appearance of n in A003004 is A003004(k) = n, then a(n) = k-1. - _Fausto A. C. Cariboni_, Jun 17 2018 %H A005049 B. E. Brown and D. M. Gordon, <a href="http://dx.doi.org/10.1090/S0025-5718-96-00765-X">On sequences without geometric progressions</a>, Math. Comp. 65 (1996), no. 216, 1749-1754. %H A005049 Sean A. Irvine, <a href="/A005049/a005049.out.txt">Example sets for a(5)-a(34)</a> %Y A005049 Cf. A005047, A005048, A005050. %K A005049 nonn,more %O A005049 5,1 %A A005049 _N. J. A. Sloane_ %E A005049 More terms from _David W. Wilson_, May 15 1997 %E A005049 a(24)-a(34) from _Sean A. Irvine_, Mar 16 2016 %E A005049 a(33) corrected by _Fausto A. C. Cariboni_, Jun 17 2018 %E A005049 a(35)-a(67) from _Fausto A. C. Cariboni_, Jun 17 2018