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A119998
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a(n) is the smallest positive integer whose square starts with (at least) n identical digits.
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4
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1, 15, 149, 2357, 10541, 57735, 745356, 1490712, 182574186, 298142397, 298142397, 1490711985, 1490711985, 10540925533895, 74535599249993, 105409255338946, 7453559924999299, 14907119849998598, 471404520791031683, 7453559924999298988
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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FORMULA
| a(n) <= A119511(n). - R. J. Mathar, Aug 08 2006
a(n) = sqrt(A192934(n)). - Alois P. Heinz, Sep 02 2011
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EXAMPLE
| Note that 15^2 = 225 and 149^2 = 22201.
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CROSSREFS
| Cf. A119511, A192934.
Sequence in context: A051272 A021414 A055431 * A119511 A023069 A121035
Adjacent sequences: A119995 A119996 A119997 * A119999 A120000 A120001
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KEYWORD
| base,nonn
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AUTHOR
| Tanya Khovanova (tanyakh(AT)yahoo.com), Jul 26 2006
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EXTENSIONS
| More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jul 29 2006
More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 08 2006
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