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 A100893 #6 Jan 21 2019 19:01:55 %S A100893 2,23,233,2333,23333 %N A100893 a(n) = smallest n-digit prime formed by appending a digit to a(n-1); a(1) = 2. %C A100893 This sequence is finite because there is no prime a(6) since 233331,233333,233337,233339 are not prime. %C A100893 This is an initial subsequence of A048549, A065122, A088603, and A127889; and for any b, the base b analog of this sequence is an initial subsequence of the base b analog of each of these three sequences. [From _Franklin T. Adams-Watters_, Jun 27 2009] %e A100893 a(1)=2 %e A100893 a(2)=23 %e A100893 a(3)=233 %e A100893 a(4)=2333 %e A100893 a(5)=23333 %K A100893 fini,nonn,base,full %O A100893 1,1 %A A100893 _Jorge Coveiro_, Jan 10 2005