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A248578
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Round(1/(Pi-n*sin(Pi/n))).
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2
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0, 1, 2, 3, 5, 7, 10, 12, 16, 19, 24, 28, 33, 38, 44, 50, 56, 63, 70, 77, 85, 94, 102, 112, 121, 131, 141, 152, 163, 174, 186, 198, 211, 224, 237, 251, 265, 280, 294, 310, 325, 341, 358, 375, 392, 410, 428, 446, 465, 484
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OFFSET
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1,3
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COMMENTS
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n*sin(Pi/n) is known as the Archimedean approximation to Pi, the present sequence measures [the reciprocal of] the error. See A248358 for the integer part.
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LINKS
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MATHEMATICA
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Table[Round[1/(Pi -n Sin[Pi/n])], {n, 50}] (* Harvey P. Dale, Jun 30 2022 *)
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PROG
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(PARI) a(n)=round(1/(Pi-n*sin(Pi/n))))
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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