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A061363
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a(1) = 9; a(n) = least number such that the concatenation a(n)a(n-1)...a(2)a(1) is a square.
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4
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9, 4, 18, 167, 2401, 4086461727, 14079962896835441528, 309880704108832516500624685064706000856, 4681896102766617737298881383797502847166028831212571921983062786215145771871779
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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EXAMPLE
| a(3)a(2)a(1) = 1849 = 43^2, a(4)a(3)a(2)a(1) = 1671849 = 1293^2.
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CROSSREFS
| Cf. A050638, A050639, A061359, A061361.
Sequence in context: A168203 A133597 A075066 * A100077 A174679 A168077
Adjacent sequences: A061360 A061361 A061362 * A061364 A061365 A061366
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KEYWORD
| nonn,base
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AUTHOR
| Amarnath_murthy (amarnath_murthy(AT)yahoo.com), Apr 28 2001
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EXTENSIONS
| Corrected by Larry Reeves (larryr(AT)acm.org), May 07 2001
More terms from UlrSchimke(AT)aol.com, Nov 06, 2001
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