login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A077513 Smallest n-digit squarefree number beginning with n. 1
1, 21, 301, 4001, 50001, 600001, 7000001, 80000002, 900000001, 1000000001, 11000000001, 120000000001, 1300000000001, 14000000000001, 150000000000001, 1600000000000001, 17000000000000002, 180000000000000001 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..18.

MATHEMATICA

snsf[n_]:=Module[{k=0, p=n*10^(n-IntegerLength[n])}, While[!SquareFreeQ[ p+k], k++]; p+k]; Array[snsf, 20] (* Harvey P. Dale, Apr 08 2018 *)

CROSSREFS

Cf. A077514.

Sequence in context: A007592 A019664 A019839 * A079517 A021784 A019618

Adjacent sequences:  A077510 A077511 A077512 * A077514 A077515 A077516

KEYWORD

base,nonn

AUTHOR

Amarnath Murthy, Nov 08 2002

EXTENSIONS

More terms from Sascha Kurz, Jan 04 2003

STATUS

approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 17 11:26 EDT 2022. Contains 353745 sequences. (Running on oeis4.)