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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

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Last modified January 22 01:28 EST 2022. Contains 350481 sequences. (Running on oeis4.)