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A061042
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Denominator of 1/16 - 1/n^2.
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11
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1, 400, 144, 784, 64, 1296, 400, 1936, 18, 2704, 784, 3600, 256, 4624, 1296, 5776, 50, 7056, 1936, 8464, 576, 10000, 2704, 11664, 49, 13456, 3600, 15376, 1024, 17424, 4624, 19600, 81, 21904, 5776, 24336, 1600, 26896, 7056, 29584
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OFFSET
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4,2
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LINKS
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Index entries for linear recurrences with constant coefficients, signature (0, 0, 0, 0, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, -6, 0, 0, 0, 0, 0, 0, 0, 10, 0, 0, 0, 0, 0, 0, 0, -12, 0, 0, 0, 0, 0, 0, 0, 12, 0, 0, 0, 0, 0, 0, 0, -10, 0, 0, 0, 0, 0, 0, 0, 6, 0, 0, 0, 0, 0, 0, 0, -3, 0, 0, 0, 0, 0, 0, 0, 1).
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FORMULA
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a(n) = 16*n^2 / gcd(16*n^2, n^2-16). - Colin Barker, Jan 13 2014
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MATHEMATICA
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Denominator/@(1/16-1/Range[4, 50]^2) (* Harvey P. Dale, May 14 2011 *)
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PROG
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(Haskell)
import Data.Ratio ((%), denominator)
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CROSSREFS
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See A061041 for comments, references, links.
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KEYWORD
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nonn,frac,nice,easy
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AUTHOR
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STATUS
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approved
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