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 A131503 Nonnegative integers n for which cos(n) is positive. 10
 0, 1, 5, 6, 7, 11, 12, 13, 14, 18, 19, 20, 24, 25, 26, 30, 31, 32, 37, 38, 39, 43, 44, 45, 49, 50, 51, 55, 56, 57, 58, 62, 63, 64, 68, 69, 70, 74, 75, 76, 81, 82, 83, 87, 88, 89, 93, 94, 95, 99, 100, 101, 102, 106, 107, 108, 112, 113, 114, 118, 119, 120, 125, 126, 127, 131, 132 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS Nonnegative integers n satisfying sin(n)0 and sin(n)*cos(n)>1 for cos(n)<0. Since sin(n)*cos(n)=sin(2n)/2, the first case becomes sin(2n)<2 for cos(n)>0 which is always correct, and the second case becomes sin(2n)>2 for cos(n)<0 which is never correct. - R. J. Mathar, Sep 07 2014 LINKS Danny Rorabaugh, Table of n, a(n) for n = 1..10000 Eric Weisstein's World of Mathematics, Cosine MATHEMATICA Select[Range[150], Cos[#]>0&] (* Harvey P. Dale, Feb 02 2012 *) PROG (Sage) [i for i in range(200) if cos(i)>0] # Danny Rorabaugh, Mar 19 2015 (PARI) lista(nn) = for (n=0, nn, if (cos(n) > 0, print1(n, ", "))); \\ Michel Marcus, Mar 19 2015 CROSSREFS Sequence in context: A104122 A336857 A049467 * A047266 A026309 A073936 Adjacent sequences:  A131500 A131501 A131502 * A131504 A131505 A131506 KEYWORD easy,nonn AUTHOR Stephen Casey (hexomino(AT)gmail.com), Aug 13 2007 EXTENSIONS 0 inserted by R. J. Mathar, Sep 06 2014 STATUS approved

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Last modified September 23 08:18 EDT 2020. Contains 337295 sequences. (Running on oeis4.)