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 A032607 #14 Feb 17 2024 10:29:47
%S A032607 13,24,35,46,57,68,79,810,911,1012,1113,1214,1315,1416,1517,1618,1719,
%T A032607 1820,1921,2022,2123,2224,2325,2426,2527,2628,2729,2830,2931,3032,
%U A032607 3133,3234,3335,3436,3537,3638,3739,3840,3941,4042,4143,4244
%N A032607 Concatenation of n and n + 2 or {n,n+2}.
%t A032607 Table[FromDigits[Flatten[IntegerDigits/@{n,n+2}]],{n,50}] (* _Harvey P. Dale_, Dec 18 2013 *)
%Y A032607 Cf. A001704, A020338.
%K A032607 nonn,base
%O A032607 1,1
%A A032607 _Patrick De Geest_, May 15 1998