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A061110
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a(1) = 1; a(n) = smallest number such that the concatenation a(1)a(2)...a(n) is a square.
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9
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OFFSET
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1,2
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COMMENTS
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The next term is too large to include.
a(n) is at most doubly exponential in n. Is there also a double exponential lower bound? - Charles R Greathouse IV, Sep 19 2012
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LINKS
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Table of n, a(n) for n=1..8.
A. Murthy, Exploring some new ideas on Smarandache type sets, functions and sequences, Smarandache Notions Journal Vol. 11 N. 1-2-3 Spring 2000.
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EXAMPLE
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a(1) = 1, a(1)a(2) = 16 = 4^2, a(1)a(2)a(3) = 169 = 13^2, 169744 = 412^2.
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CROSSREFS
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Cf. A061109, A051671. The actual squares are in A048557.
Sequence in context: A053490 A265383 A264375 * A110460 A159190 A236766
Adjacent sequences: A061107 A061108 A061109 * A061111 A061112 A061113
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KEYWORD
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base,nonn
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AUTHOR
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Amarnath Murthy, Apr 20 2001
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EXTENSIONS
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More terms from Larry Reeves (larryr(AT)acm.org), Jul 23 2001
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STATUS
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approved
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