The OEIS is supported by the many generous donors to the OEIS Foundation.
%I #10 Oct 09 2023 12:51:11
%S 2,23,235,2356,23567,2356710,235671011,23567101113,2356710111314,
%T 235671011131415,23567101113141517,2356710111314151719,
%U 235671011131415171921,23567101113141517192122
%N Concatenation of the first n terms of A144338.
%C Concatenation of the squarefree numbers A005117(2) to A005117(n+1).
%H Harvey P. Dale, <a href="/A159902/b159902.txt">Table of n, a(n) for n = 1..355</a>
%t Module[{nn=25,sf},sf=Select[Range[2,nn],SquareFreeQ];Table[FromDigits[Flatten[ IntegerDigits/@ Take[sf,n]]],{n,Length[sf]}]] (* _Harvey P. Dale_, Oct 09 2023 *)
%Y Cf. A144338, A005117, A159901.
%K nonn,base,less
%O 1,1
%A _Jaroslav Krizek_, Apr 25 2009
%E Slightly edited by _R. J. Mathar_, Apr 28 2009