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 A198671 Decimal expansion of the absolute minimum of cos(x)+cos(2x)+cos(3x)+cos(4x). 3
 1, 5, 1, 9, 5, 5, 7, 8, 8, 1, 6, 4, 2, 8, 4, 8, 2, 5, 1, 3, 6, 9, 4, 2, 6, 8, 1, 1, 3, 2, 9, 8, 5, 0, 7, 3, 4, 5, 5, 8, 7, 7, 8, 4, 3, 8, 3, 3, 6, 1, 2, 2, 9, 4, 5, 2, 2, 9, 8, 8, 5, 5, 0, 0, 2, 8, 5, 0, 6, 9, 8, 9, 3, 4, 7, 1, 3, 4, 1, 7, 9, 3, 5, 7, 7, 0, 4, 2, 5, 5, 5, 8, 2, 7, 4, 8, 0, 5, 4 (list; constant; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS See A196361 for a guide to related sequences. LINKS Table of n, a(n) for n=1..99. EXAMPLE x=1.002750019227300659428346483723194... min=-1.519557881642848251369426811329... MATHEMATICA n = 4; f[t_] := Cos[t]; s[t_] := Sum[f[k*t], {k, 1, n}]; x = N[Minimize[s[t], t], 110]; u = Part[x, 1] v = 2 Pi - t /. Part[x, 2] RealDigits[u] (* A198671 *) RealDigits[v] (* A198672 *) Plot[s[t], {t, -3 Pi, 3 Pi}] (* Second program: *) Root[-125 + 600x + 1227x^2 + 512x^3, 1] // RealDigits[#, 10, 99]& // First (* Jean-François Alcover, Feb 19 2013 *) CROSSREFS Cf. A196361. Sequence in context: A189234 A199736 A207873 * A129343 A342634 A010482 Adjacent sequences: A198668 A198669 A198670 * A198672 A198673 A198674 KEYWORD nonn,cons AUTHOR Clark Kimberling, Oct 28 2011 STATUS approved

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Last modified September 23 14:50 EDT 2023. Contains 365551 sequences. (Running on oeis4.)