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 A099082 #20 Sep 14 2024 02:17:16
%S A099082 1,5,9,11,65,159
%N A099082 Numbers k such that 1.2. ... .k-1.k + 2 is prime (dot between numbers means concatenation).
%C A099082 Numbers k such that A007908(k)+2 is prime.
%C A099082 Next term is greater than 2000.
%C A099082 a(7) > 4034. - _J.W.L. (Jan) Eerland_, Nov 19 2022
%C A099082 a(7) > 15176. - _J.W.L. (Jan) Eerland_, Feb 24 2023
%C A099082 a(7) > 30000. - _Michael S. Branicky_, Sep 13 2024
%e A099082 9 is in the sequence because 123456789 + 2 is prime.
%t A099082 n=0;Monitor[Parallelize[While[True,If[PrimeQ[2+ToExpression[StringJoin[ToString/@Table[k,{k,1,n}]]]],Print[n]];n++];n],n] (* _J.W.L. (Jan) Eerland_, Nov 19 2022 *)
%Y A099082 Cf. A007908, A099081, A099083.
%K A099082 base,more,nonn
%O A099082 1,2
%A A099082 _Farideh Firoozbakht_, Oct 23 2004