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A065737
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Largest square <= binomial(n,2).
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1
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0, 1, 1, 4, 9, 9, 16, 25, 36, 36, 49, 64, 64, 81, 100, 100, 121, 144, 169, 169, 196, 225, 225, 256, 289, 324, 324, 361, 400, 400, 441, 484, 484, 529, 576, 625, 625, 676, 729, 729, 784, 841, 900, 900, 961, 1024, 1024, 1089, 1156, 1225
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OFFSET
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1,4
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LINKS
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FORMULA
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MATHEMATICA
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Floor[Sqrt[#]]^2&/@Binomial[Range[50], 2] (* Harvey P. Dale, Feb 28 2020 *)
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PROG
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(PARI) { for (n=1, 1000, a=sqrtint(binomial(n, 2))^2; write("b065737.txt", n, " ", a) ) } \\ Harry J. Smith, Oct 28 2009
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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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STATUS
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approved
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