A198749 Decimal expansion of the absolute minimum of f(x)+f(2x)+f(3x)+f(4x), where f(x)=sin(x)-cos(x).

5, 3, 7, 1, 0, 1, 6, 7, 7, 8, 2, 4, 5, 6, 8, 0, 5, 8, 5, 8, 0, 1, 2, 9, 8, 6, 6, 0, 9, 1, 4, 4, 0, 4, 4, 5, 8, 3, 3, 7, 9, 1, 9, 2, 4, 8, 6, 2, 4, 4, 2, 0, 3, 4, 4, 0, 6, 5, 5, 6, 3, 3, 9, 9, 9, 2, 1, 7, 1, 4, 2, 2, 7, 6, 1, 9, 5, 3, 1, 4, 9, 6, 7, 0, 8, 7, 2, 0, 5, 9, 1, 1, 2, 6, 3, 7, 1, 8, 8

Offset

1,1

Comments

See A198745 for a guide to related sequences.

Links

Table of n, a(n) for n=1..99.

Example

x=6.02199019639758406905296413941959795147011...
min=-5.37101677824568058580129866091440445833...

Mathematica

f[t_] := Sin[t] - Cos[t]
n = 4; s[t_] := Sum[f[k*t], {k, 1, n}]
x = N[Minimize[s[t], t], 110]; u = Part[x, 1]
v = t /. Part[x, 2]
RealDigits[u] (* A198749 *)
RealDigits[v] (* A198750 *)
Plot[s[t], {t, -2 Pi, 2 Pi}, PlotRange -> {-6, 4}]

Prog

(PARI) my(t=solve(x=-1, 0, cos(x)+sin(x)+2*cos(2*x)+2*sin(2*x)+3*cos(3*x)+3*sin(3*x)+4*cos(4*x)+4*sin(4*x))); sin(t)-cos(t)+sin(2*t)-cos(2*t)+sin(3*t)-cos(3*t)+sin(4*t)-cos(4*t) \\ Charles R Greathouse IV, May 18 2026

Crossrefs

Cf. A198745.

Sequence in context: A237656 A371847 A097907 * A338294 A066253 A065169

Adjacent sequences: A198746 A198747 A198748 * A198750 A198751 A198752

Keyword

nonn,cons

Author

Clark Kimberling, Oct 29 2011

Status

approved