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Search: id:A061361
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| A061361 |
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a(1) = 4; a(n) = least number such that the concatenation a(n)a(n-1)...a(2)a(1) is a square. |
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7
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| 4, 6, 17, 604, 9612, 85848855, 109457393440691436, 16484027824615378535694780556419522, 2537811713051483817817710620248313487995814710180147690293469081793581
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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a(3)a(2)a(1) = 1764 = 42^2, a(4)a(3)a(2)a(1) = 6041764 = 2458^2, a(5)a(4)a(3)a(2)a(1) = 8584885596126041764 = 2929997542^2.
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CROSSREFS
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Cf. A050636, A050637, A061359, A061363.
Sequence in context: A034492 A125691 A079803 this_sequence A113610 A062046 A102020
Adjacent sequences: A061358 A061359 A061360 this_sequence A061362 A061363 A061364
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KEYWORD
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nonn,base
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AUTHOR
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Amarnath_murthy (amarnath_murthy(AT)yahoo.com), Apr 28 2001
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EXTENSIONS
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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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