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 A161423 #19 Jan 24 2023 06:39:30 %S A161423 3,5,7,11,19,31,59,79,127,163 %N A161423 Primes in A161420. %H A161423 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 A161423 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 A161423 Cf. A139253, A161420, A161421. %K A161423 more,nonn %O A161423 1,1 %A A161423 _Omar E. Pol_, Jun 10 2009 %E A161423 Error in data corrected by _D. S. McNeil_, Aug 17 2010 %E A161423 a(10) from _Michael S. Branicky_, Jan 23 2023