1,1

What is the density of the sequence? I am convinced that this sequence has the same density as A026313.

Table of n, a(n) for n=1..68.

|cos(5)*cos(7)| < (cos(6))^2, therefore 5 is in the sequence.

Select[Range[120], Abs[Cos[ # ]*Cos[ # + 2]] < Cos[ # + 1]^2 &]

Cf. A026313 [same definition with sin instead of cos].

Sequence in context: A052490 A332076 A248562 * A194383 A186326 A139364

Adjacent sequences: A117669 A117670 A117671 * A117673 A117674 A117675

nonn

Stefan Steinerberger, Apr 12 2006

Offset corrected by Sean A. Irvine, Sep 25 2019

approved