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

 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, 1234567891022847726601, 12345678910116040727447056, 12345678910111210088193915136, 1234567891011121368630088707263161, 12345678910111213145200045239801398529 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Table of n, a(n) for n=1..14. EXAMPLE a(3) = 12321 = 111^2. a(10) = 1234567891022847726601 = 35136418301^2. [Corrected by Sean A. Irvine, Jan 28 2024] CROSSREFS Cf. A007908. 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 a(10) corrected and a(14) by Sean A. Irvine, Jan 28 2024 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.

Last modified August 5 06:29 EDT 2024. Contains 374935 sequences. (Running on oeis4.)