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 A198670 Decimal expansion of the least x>0 that gives the absolute minimum of cos(x)+cos(2x)+cos(3x). 2
 1, 2, 9, 2, 9, 4, 3, 0, 5, 8, 5, 0, 5, 4, 2, 6, 6, 6, 5, 2, 2, 5, 6, 3, 1, 1, 9, 5, 4, 6, 9, 1, 3, 5, 4, 8, 5, 4, 3, 4, 6, 2, 9, 7, 1, 5, 0, 0, 4, 7, 2, 3, 7, 7, 8, 6, 7, 0, 2, 1, 6, 2, 0, 7, 4, 3, 6, 7, 3, 2, 9, 0, 0, 6, 1, 7, 1, 9, 5, 6, 5, 8, 8, 0, 6, 2, 0, 1, 6, 0, 5, 4, 6, 1, 0, 7, 6, 4, 3 (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=1.2929430585054266652256311954691354... min(f(x))=-1.3155651547204494123522707... MATHEMATICA n = 3; 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] (* A196361 *) RealDigits[v] (* A198670 *) Plot[s[t], {t, -3 Pi, 3 Pi}] RealDigits[ ArcSin[ Sqrt[7 + Sqrt[7]/2]/3], 10, 99] // First (* Jean-François Alcover, Feb 15 2013 *) CROSSREFS Cf. A196361. Sequence in context: A171546 A268682 A010699 * A074916 A228375 A188966 Adjacent sequences: A198667 A198668 A198669 * A198671 A198672 A198673 KEYWORD nonn,cons AUTHOR Clark Kimberling, Oct 28 2011 STATUS approved

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Last modified September 27 05:14 EDT 2023. Contains 365674 sequences. (Running on oeis4.)