A198671 - OEIS

A198671

Decimal expansion of the absolute minimum of cos(x)+cos(2x)+cos(3x)+cos(4x).

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

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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}];