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A205326
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Decimal expansion of the sum of [0;n,n,n,...]^2 for n=1..infinity.
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1
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9, 1, 5, 5, 8, 7, 9, 1, 9, 9, 0, 1, 8, 1, 9, 7, 2, 5, 1, 9, 9, 8, 1, 6, 8, 5, 3, 8, 0, 3, 1, 9, 0, 0, 8, 9, 7, 3, 5, 3, 2, 0, 4, 6, 0, 1, 8, 9, 6, 6, 9, 0, 2, 4, 1, 2, 2, 7, 6, 9, 5, 1, 7, 0, 9, 6, 2, 1, 8, 2, 7, 0, 5, 5, 6, 4, 6, 5, 3, 3, 5, 9, 7, 5, 5, 3, 7
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OFFSET
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0,1
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COMMENTS
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This is the total area of all squares with sides parallel to the axes of the Cartesian coordinate system, the lower left vertex at (n,0) and the upper right vertex on f(x)=1/x for n=1..infinity.
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LINKS
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FORMULA
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Sum_{n>=1} 1/[n;n,n,...]^2.
Sum_{n>=1} 4/(n + sqrt(n^2 + 4))^2.
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EXAMPLE
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0.9155879199018197251998168538031900897353...
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PROG
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CROSSREFS
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KEYWORD
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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