login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A159901 Concatenation of the first n squarefree numbers A005117. 1
1, 12, 123, 1235, 12356, 123567, 12356710, 1235671011, 123567101113, 12356710111314, 1235671011131415, 123567101113141517, 12356710111314151719, 1235671011131415171921, 123567101113141517192122 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..15.

FORMULA

Prepend 1 to the terms of A159902(n-1).

CROSSREFS

Cf. A005117.

Sequence in context: A187871 A187869 A262574 * A159900 A134802 A141266

Adjacent sequences:  A159898 A159899 A159900 * A159902 A159903 A159904

KEYWORD

nonn,base,less

AUTHOR

Jaroslav Krizek, Apr 25 2009

EXTENSIONS

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

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 6 06:00 EDT 2021. Contains 343580 sequences. (Running on oeis4.)