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A065734
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Largest square <= sigma(n).
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1
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1, 1, 4, 4, 4, 9, 4, 9, 9, 16, 9, 25, 9, 16, 16, 25, 16, 36, 16, 36, 25, 36, 16, 49, 25, 36, 36, 49, 25, 64, 25, 49, 36, 49, 36, 81, 36, 49, 49, 81, 36, 81, 36, 81, 64, 64, 36, 121, 49, 81, 64, 81, 49, 100, 64, 100, 64, 81, 49, 144, 49, 81, 100, 121, 81, 144, 64, 121, 81, 144
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OFFSET
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1,3
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LINKS
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FORMULA
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MATHEMATICA
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Table[Floor[Sqrt[DivisorSigma[1, n]]]^2, {n, 70}] (* Harvey P. Dale, Oct 05 2015 *)
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PROG
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(PARI) { for (n=1, 1000, a=sqrtint(sigma(n))^2; write("b065734.txt", n, " ", a) ) } \\ Harry J. Smith, Oct 28 2009
(Maxima)
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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