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 A100894 #12 Jan 21 2019 19:01:55 %S A100894 3,31,311,3119,31193 %N A100894 a(n) = smallest n-digit prime formed by appending a digit to a(n-1); a(1) = 3. %C A100894 Sequence is full since appending 0, 4, 6, 8, or 5 will lead to an obvious composite and 311931, 311933, 311937, 311939 are also composite. These are the first 5 entries of A048550. - _Michel Marcus_, Jun 30 2013 %e A100894 a(1)=3 %e A100894 a(2)=31 %e A100894 a(3)=311 %e A100894 a(4)=3119 %e A100894 a(5)=31193 %K A100894 nonn,fini,full,base %O A100894 1,1 %A A100894 _Jorge Coveiro_, Jan 10 2005