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 A033162 #14 Jul 08 2025 19:43:03 %S A033162 3,4,6,7,12,13,15,16,30,31,33,34,39,40,42,43,84,85,87,88,93,94,96,97, %T A033162 111,112,114,115,120,121,123,124,246,247,249,250,255,256,258,259,273, %U A033162 274,276,277,282,283,285,286,327,328,330,331,336,337,339,340,354,355,357,358,363 %N A033162 Begins with (3, 4); avoids 3-term arithmetic progressions. %C A033162 Also: Stanley sequence S(3). - _M. F. Hasler_, Jan 18 2016 %D A033162 Iacobescu, F. 'Smarandache Partition Type and Other Sequences.' Bull. Pure Appl. Sci. 16E, 237-240, 1997. %D A033162 H. Ibstedt, A Few Smarandache Sequences, Smarandache Notions Journal, Vol. 8, No. 1-2-3, 1997, 170-183. %H A033162 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/NonarithmeticProgressionSequence.html">Nonarithmetic Progression Sequence</a> %H A033162 <a href="/index/St#Stanley">Index entries related to Stanley sequences</a> %F A033162 a(n) = A005836(n)+3. - _M. F. Hasler_, Jan 18 2016 %Y A033162 a(n) = A003278(n)+2 %K A033162 nonn %O A033162 1,1 %A A033162 _N. J. A. Sloane_