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 A101888 #5 Jan 21 2014 12:17:58 %S A101888 1,2,3,4,6,7,8,9,11,12,13,14,16,17,18,19,22,23,24,25,27,28,29,30,32, %T A101888 33,34,35,37,38,39,40,43,44,45,46,48,49,50,51,53,54,55,56,58,59,60,61, %U A101888 64,65,66,67,69,70,71,72,74,75,76,77,79,80,81,82,86,87,88,90,91,92,93,95 %N A101888 Smallest natural number sequence without any length 5 equidistant arithmetic subsequences. %e A101888 5 is out because of 1,2,3,4,5. 21 is out because of 1,6,11,16,21. %Y A101888 Cf. A101889, A101884, A101886. %Y A101888 A selection of sequences related to "no three-term arithmetic progression": A003002, A003003, A003278, A004793, A005047, A005487, A033157, A065825, A092482, A093678, A093679, A093680, A093681, A093682, A094870, A101884, A101886, A101888, A140577, A185256, A208746, A229037. %K A101888 nonn %O A101888 1,2 %A A101888 Douglas Stones (dssto1(AT)student.monash.edu.au), Dec 20 2004