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 A365255 Decimal expansion of Product_{n>=2} cos(Pi/(2*n)). 2
 4, 2, 9, 7, 8, 0, 2, 1, 6, 4, 3, 7, 9, 9, 1, 7, 0, 6, 5, 8, 4, 7, 8, 9, 5, 1, 4, 7, 0, 6, 3, 3, 0, 4, 8, 8, 4, 9, 2, 5, 3, 7, 6, 3, 9, 7, 4, 5, 4, 8, 6, 5, 7, 1, 0, 8, 2, 7, 6, 5, 7, 3, 7, 4, 3, 6, 8, 8, 3, 3, 6, 8, 8, 4, 3, 7, 2, 9, 1, 5, 9, 5, 3, 1, 0 (list; constant; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS Table of n, a(n) for n=0..84. FORMULA this* A365256 = A085365. EXAMPLE 0.4297802164379917065847895147063304... PROG (PARI) exp(sumpos(n=2, log(cos(Pi/(2*n))))) \\ Michel Marcus, Aug 29 2023 CROSSREFS Cf. A085365, A365256. Sequence in context: A237126 A246380 A200639 * A243968 A104583 A278103 Adjacent sequences: A365252 A365253 A365254 * A365256 A365257 A365258 KEYWORD cons,nonn AUTHOR R. J. Mathar, Aug 29 2023 STATUS approved

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Last modified August 15 12:24 EDT 2024. Contains 375173 sequences. (Running on oeis4.)