A159902 - OEIS

A159902

Concatenation of the first n terms of A144338.

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

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

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

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 *)

CROSSREFS

Cf. A144338, A005117, A159901.

Sequence in context: A093672 A262571 A283560 * A301339 A294268 A118385

Adjacent sequences: A159899 A159900 A159901 * A159903 A159904 A159905

KEYWORD

nonn,base,less

AUTHOR

Jaroslav Krizek, Apr 25 2009

EXTENSIONS

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

STATUS

approved