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 A032632 #9 May 12 2019 11:54:31
%S A032632 211,1019,1423,2029,2837,3847,4049,5059,5261,5867,6271,6473,7079,8089,
%T A032632 8291,100109,104113,110119,112121,118127,122131,124133,142151,148157,
%U A032632 160169,164173,170179,172181,178187,188197,194203,208217
%N A032632 Primes that are decimal concatenations of n with n + 9.
%H A032632 Harvey P. Dale, <a href="/A032632/b032632.txt">Table of n, a(n) for n = 1..2500</a>
%t A032632 Select[Table[FromDigits[Flatten[IntegerDigits/@{n,n+9}]],{n,250}],PrimeQ] (* _Harvey P. Dale_, May 12 2019 *)
%Y A032632 Cf. A032614, A032624.
%K A032632 nonn,base
%O A032632 1,1
%A A032632 _Patrick De Geest_, May 15 1998
%E A032632 Edited by _Charles R Greathouse IV_, Apr 30 2010