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Search: id:A068117
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| A068117 |
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Smallest square beginning with concatenation of first n natural numbers. |
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+0
1
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| 1, 121, 12321, 1234321, 123454321, 12345654321, 1234567654321, 123456787654321, 12345678987654321, 123456789100009878664283136, 12345678910116040727447056, 12345678910111210088193915136, 1234567891011121368630088707263161
(list; graph; listen)
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OFFSET
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1,2
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EXAMPLE
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a(3) = 12321 = 111^2 a(10) = 123456789100009878664283136 = 11111111065056^2.
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CROSSREFS
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Sequence in context: A062689 A057139 A002477 this_sequence A080162 A030174 A066625
Adjacent sequences: A068114 A068115 A068116 this_sequence A068118 A068119 A068120
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KEYWORD
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base,easy,nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Feb 20 2002
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EXTENSIONS
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More terms from Ralf Stephan (ralf(AT)ark.in-berlin.de), Oct 12 2002
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