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 A033163 #14 Jul 08 2025 19:43:10 %S A033163 3,5,6,8,12,14,15,17,30,32,33,35,39,41,42,44,84,86,87,89,93,95,96,98, %T A033163 111,113,114,116,120,122,123,125,246,248,249,251,255,257,258,260,273, %U A033163 275,276,278,282,284,285,287,327,329,330,332,336,338,339,341,354,356,357,359,363 %N A033163 Begins with (3, 5) and avoids 3-term arithmetic progressions. %D A033163 Iacobescu, F. 'Smarandache Partition Type and Other Sequences.' Bull. Pure Appl. Sci. 16E, 237-240, 1997. %D A033163 H. Ibstedt, A Few Smarandache Sequences, Smarandache Notions Journal, Vol. 8, No. 1-2-3, 1997, 170-183. %H A033163 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/NonarithmeticProgressionSequence.html">Nonarithmetic Progression Sequence</a> %Y A033163 a(n) = A186776(n)+3 = A004793(n)+2 = A033160(n)+1. Cf. A185256. %K A033163 nonn %O A033163 1,1 %A A033163 _N. J. A. Sloane_