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 A099083 #13 Sep 14 2024 02:17:12 %S A099083 5,31,103,111,119,201 %N A099083 Numbers k such that 1.2. ... .k-1.k - 2 is prime (where dot between numbers means concatenation). %C A099083 Each term is odd and next term is greater than 2200. %C A099083 Any further terms exceed 13000. - _Lucas A. Brown_, Mar 06 2024 %C A099083 Any further terms exceed 30000. - _Michael S. Branicky_, Sep 13 2024 %e A099083 31 is in the sequence because 12345678910111213141516171819202122232425262728293031 - 2 is prime. %Y A099083 Cf. A099081, A099082. %K A099083 base,more,nonn %O A099083 1,1 %A A099083 _Farideh Firoozbakht_, Nov 03 2004