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 A280207 Decimal expansion of x such that tan(Pi/x) + sin(Pi/x)*cos(Pi/x) = 2*Pi/x. 0
 3, 1, 8, 1, 7, 6, 0, 1, 2, 9, 2, 7, 0, 1, 7, 1, 3, 8, 7, 6, 2, 0, 4, 6, 8, 0, 4, 9, 5, 1, 3, 0, 3, 1, 9, 6, 4, 2, 1, 7, 2, 1, 2, 4, 6, 3, 4, 9, 3, 5, 1, 4, 2, 1, 2, 4, 5, 9, 9, 4, 9, 2, 3, 1, 4, 9, 5, 7, 6, 8, 6, 6, 1, 8, 4, 0, 7, 0, 3, 1, 6, 5, 9, 8, 3, 7, 6 (list; constant; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS This is the hypothetical number of sides an equilateral polygon would have to have in order to create the same area between it and a circle in both its inscribed and circumscribed forms. It is probably transcendental, though that has not been proved. LINKS Ondrej Hrdina, First 50000 digits Ondrej Hrdina, In-depth description FORMULA Solution of tan(Pi/x) + sin(Pi/x)*cos(Pi/x) = 2*Pi/x. (No closed-form expression for x exists.) EXAMPLE x = 3.18176012927017138762046804951303196421721246349351... CROSSREFS Sequence in context: A155789 A179393 A217598 * A319045 A182510 A112420 Adjacent sequences:  A280204 A280205 A280206 * A280208 A280209 A280210 KEYWORD nonn,cons AUTHOR Ondrej Hrdina, Dec 30 2016 EXTENSIONS More digits from Jon E. Schoenfield, Mar 16 2018 STATUS approved

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Last modified May 25 02:47 EDT 2019. Contains 323539 sequences. (Running on oeis4.)