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 A139559 #10 Feb 24 2021 02:48:18 %S A139559 3,5,7,11,17,19,23,31,59,61,67,71,83,103,107,127,139,233,239,311,439, %T A139559 883,919,971,983,1039,1087,1091,1123,1399,1487,1567,1747,1811,1999, %U A139559 2131,2383,2467,2927,3391,3583,3659,3671,3691 %N A139559 Primes in A139252 (related to the toothpick structure). %H A139559 David Applegate, Omar E. Pol and N. J. A. Sloane, <a href="/A000695/a000695_1.pdf">The Toothpick Sequence and Other Sequences from Cellular Automata</a>, Congressus Numerantium, Vol. 206 (2010), 157-191. [There is a typo in Theorem 6: (13) should read u(n) = 4.3^(wt(n-1)-1) for n >= 2.] %H A139559 N. J. A. Sloane, <a href="/wiki/Catalog_of_Toothpick_and_CA_Sequences_in_OEIS">Catalog of Toothpick and Cellular Automata Sequences in the OEIS</a> %Y A139559 Cf. A139250, A139251, A139252, A139253, A139254. %K A139559 nonn %O A139559 1,1 %A A139559 _Omar E. Pol_, May 17 2008 %E A139559 Terms after a(17) from _Nathaniel Johnston_, Mar 29 2011