A004083 Numbers k such that cos(k-1) <= 0 and cos(k) > 0.

5, 11, 18, 24, 30, 37, 43, 49, 55, 62, 68, 74, 81, 87, 93, 99, 106, 112, 118, 125, 131, 137, 143, 150, 156, 162, 169, 175, 181, 187, 194, 200, 206, 213, 219, 225, 231, 238, 244, 250, 257, 263, 269, 275, 282, 288, 294, 301, 307, 313, 319, 326, 332, 338, 345

Offset

1,1

Links

Table of n, a(n) for n=1..55.

Mathematica

Select[Range[0, 300], Cos[# - 1] <= 0 && Cos[#] > 0 &] (* T. D. Noe, Mar 21 2013 *)
SequencePosition[Table[If[Cos[n]>0, 1, 0], {n, 400}], {0, 1}][[All, 2]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Dec 12 2018 *)

Prog

(PARI) lista(m) = {for (i=0, m, if ((cos(i-1)<=0) && (cos(i) > 0), print1(i, ", ")); ); } \\ Michel Marcus, Mar 21 2013

Crossrefs

Cf. A145005 (except first term). - Sébastien Dumortier, Sep 30 2008

Sequence in context: A314272 A184822 A145005 * A190365 A056000 A080566

Adjacent sequences: A004080 A004081 A004082 * A004084 A004085 A004086

Keyword

nonn

Author

Clark Kimberling

Extensions

Term 1 removed (at the suggestion of Michel Marcus) by T. D. Noe, Mar 21 2013

Status

approved