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A073518
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Cotangent of Pi/prime(n), rounded to nearest integer.
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0
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0, 1, 1, 2, 3, 4, 5, 6, 7, 9, 10, 12, 13, 14, 15, 17, 19, 19, 21, 23, 23, 25, 26, 28, 31, 32, 33, 34, 35, 36, 40, 42, 44, 44, 47, 48, 50, 52, 53, 55, 57, 58, 61, 61, 63, 63, 67, 71, 72, 73, 74, 76, 77, 80, 82, 84, 86, 86, 88, 89, 90, 93, 98, 99, 100, 101, 105, 107, 110, 111, 112
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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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a(n) = round(cotan(Pi/prime(n))) or a(n) = round(1/tan(Pi/prime(n))).
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EXAMPLE
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For n=8: prime(8)=19; cotan(Pi/19) = 5.9926... => 6.
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MATHEMATICA
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Table[Round[Cot[Pi/Prime[n]]], {n, 71}] (* Jayanta Basu, Jul 01 2013 *)
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PROG
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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