A159902 Concatenation of the first n terms of A144338.

2, 23, 235, 2356, 23567, 2356710, 235671011, 23567101113, 2356710111314, 235671011131415, 23567101113141517, 2356710111314151719, 235671011131415171921, 23567101113141517192122

Offset: 1

Author

Jaroslav Krizek, Apr 25 2009

Keywords

• nonn
• base
• less

Comments

Concatenation of the squarefree numbers A005117(2) to A005117(n+1).

Links

• Harvey P. Dale, Table of n, a(n) for n = 1..355

Crossrefs

Cf. A144338, A005117, A159901.

Programs

Mathematica

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 *)

Extensions

Slightly edited by R. J. Mathar, Apr 28 2009