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 A160952 #13 Sep 28 2016 23:14:24 %S A160952 2,29,293,2939,29399,293999,2939999,29399999 %N A160952 a(n)=largest (n+1)-digit prime formed by appending a digit to a(n-1); a(0)=2. %C A160952 There is no prime a(8) since 293999991 to 293999999 are all composite. %C A160952 This is also one of five longest possible sequences of primes where each term is formed by appending a digit to the previous term. Alternatively, one can view 29399999 as a prime where truncating the last digit successively always produces a prime. These are called Right-truncatable primes and the other four with 8 digits are 23399339, 37337999, 5939339 and 73939133. A list of all 83 possible Right-truncatable primes can be found in links for A024770. I have independently verified that this list is complete. %e A160952 a(0)=2, a(1)=29, a(2)=293, a(3)=2939, a(4)=29399, a(5)=293999, a(6)=2939999, a(7)=29399999. %Y A160952 Cf. A024770, A000040. %K A160952 base,fini,full,nonn,uned %O A160952 0,1 %A A160952 Vladislav-Stepan Malakhovsky and _Juri-Stepan Gerasimov_, May 31 2009 %E A160952 Syntactically incorrect maple code deleted by R. J. Mathar, Oct 15 2011