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A010474
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Decimal expansion of square root of 18.
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12
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4, 2, 4, 2, 6, 4, 0, 6, 8, 7, 1, 1, 9, 2, 8, 5, 1, 4, 6, 4, 0, 5, 0, 6, 6, 1, 7, 2, 6, 2, 9, 0, 9, 4, 2, 3, 5, 7, 0, 9, 0, 1, 5, 6, 2, 6, 1, 3, 0, 8, 4, 4, 2, 1, 9, 5, 3, 0, 0, 3, 9, 2, 1, 3, 9, 7, 2, 1, 9, 7, 4, 3, 5, 3, 8, 6, 3, 2, 1, 1, 1, 6, 5, 5, 1, 1, 6, 2, 6, 0, 2, 9, 8, 2, 9, 2, 4, 7, 1
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OFFSET
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1,1
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COMMENTS
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Continued fraction expansion is 4 followed by {4, 8} repeated. - Harry J. Smith, Jun 05 2009
3*sqrt(2) = sqrt(18) is also the minimum width of the arms of the cellular automaton described in A294020. - Omar E. Pol, Oct 29 2017
Equals lambda(3) where lambda(n) = n*Product_{k=2..n-1} k^((n-k)/(n-k+1)). - Michel Marcus, Apr 02 2020
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LINKS
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EXAMPLE
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4.242640687119285146405066172629094235709015626130844219530039213972197....
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MAPLE
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MATHEMATICA
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PROG
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(Magma) SetDefaultRealField(RealField(100)); Sqrt(18); // G. C. Greubel, Feb 14 2019
(Sage) numerical_approx(sqrt(18), digits=100) # G. C. Greubel, Feb 14 2019
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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