%I #14 Feb 17 2024 10:29:47

%S 13,24,35,46,57,68,79,810,911,1012,1113,1214,1315,1416,1517,1618,1719,

%T 1820,1921,2022,2123,2224,2325,2426,2527,2628,2729,2830,2931,3032,

%U 3133,3234,3335,3436,3537,3638,3739,3840,3941,4042,4143,4244

%N Concatenation of n and n + 2 or {n,n+2}.

%t Table[FromDigits[Flatten[IntegerDigits/@{n,n+2}]],{n,50}] (* _Harvey P. Dale_, Dec 18 2013 *)

%Y Cf. A001704, A020338.

%K nonn,base

%O 1,1

%A _Patrick De Geest_, May 15 1998