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 A005050 #35 Jun 18 2018 03:26:42 %S A005050 6,7,8,9,11,12,13,14,16,17,18,19,21,22,23,24,25,28,31,32,34,35,36,38, %T A005050 39,40,43,44,45,47,48,49,50,53,55,57,58,60,61,63,64,65,67,69,70,72,73, %U A005050 74,75,79,81,82,84,85,87,88,90,92,93,94,95,97,98,99,100,104 %N A005050 Minimal span of set of n elements with no 6-term arithmetic progression. %C A005050 If the first appearance of n in A003005 is A003005(k) = n, then a(n) = k-1. - _Fausto A. C. Cariboni_, Jun 17 2018 %H A005050 Fausto A. C. Cariboni, <a href="/A005050/b005050.txt">Table of n, a(n) for n = 6..95</a> %H A005050 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 A005050 Sean A. Irvine, <a href="/A005050/a005050.out.txt">Example sets for a(6)-a(38)</a> %Y A005050 Cf. A005047, A005048, A005049. %K A005050 nonn %O A005050 6,1 %A A005050 _N. J. A. Sloane_ %E A005050 More terms from _David W. Wilson_, May 15 1997 %E A005050 a(25)-a(38) from _Sean A. Irvine_, Mar 17 2016 %E A005050 a(39)-a(71) from _Fausto A. C. Cariboni_, Jun 17 2018