login
This site is supported by donations to The OEIS Foundation.

 

Logo

Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing.
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A068117 Smallest square beginning with concatenation of first n natural numbers. 0
1, 121, 12321, 1234321, 123454321, 12345654321, 1234567654321, 123456787654321, 12345678987654321, 123456789100009878664283136, 12345678910116040727447056, 12345678910111210088193915136, 1234567891011121368630088707263161 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..13.

EXAMPLE

a(3) = 12321 = 111^2 a(10) = 123456789100009878664283136 = 11111111065056^2.

CROSSREFS

Sequence in context: A002477 A173426 A261570 * A080162 A030174 A180153

Adjacent sequences:  A068114 A068115 A068116 * A068118 A068119 A068120

KEYWORD

base,easy,nonn

AUTHOR

Amarnath Murthy, Feb 20 2002

EXTENSIONS

More terms from Ralf Stephan, Oct 12 2002

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 December 14 15:07 EST 2019. Contains 329979 sequences. (Running on oeis4.)