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 A139254 #7 Feb 24 2021 02:48:18 %S A139254 2,5,13,17,19,29,31,37,41,53,59,61,71,73,83,89,97,101,103,107,109,113, %T A139254 127,131,137,139,149,151,157,163,167,173,179,181,191 %N A139254 Primes that are not toothpick primes. %C A139254 Primes that are not members of A139253. %H A139254 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 A139254 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 A139254 Cf. A000040, A139250, A139251, A139252, A139253. %K A139254 nonn %O A139254 1,1 %A A139254 _Omar E. Pol_, May 11 2008