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 A141330 a(n) = number of positive integers k, k < n, where the sine of k radians is < the sine of n radians. 6
 0, 1, 0, 0, 0, 2, 4, 7, 4, 2, 0, 4, 8, 13, 9, 5, 1, 4, 10, 17, 15, 9, 3, 3, 11, 19, 24, 15, 7, 1, 11, 21, 32, 21, 11, 1, 10, 22, 35, 29, 17, 5, 8, 22, 37, 38, 23, 9, 5, 21, 37, 48, 31, 15, 1, 19, 37, 56, 40, 22, 4, 15, 35, 56, 50, 30, 10, 10, 32, 54, 63, 40, 18, 4, 28, 52, 75, 50, 26 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,6 COMMENTS Leroy Quet observed (Aug 01 2008) that the scatterplot produced by the "graph" display shows an interesting hexagonal pattern. Robert Israel (see link) noticed that this is more dramatic when one plots 10000 terms. Franklin T. Adams-Watters then commented as follows: "What we are looking at is basically a graphical representation of the continued fraction for pi (or more precisely, 2*pi). Robert Israel's graph is, I think, showing the famous good approximation pi ~ 355/113; the scatterplot seems to represent several convergents between 22/7 and 355/113.s" - N. J. A. Sloane, Oct 03 2008 LINKS Diana Mecum, Table of n, a(n) for n = 1..1000 Robert Israel, Scatterplot of first 10000 terms MATHEMATICA Table[Count[Range[n - 1], k_ /; Sin[k] < Sin[n]], {n, 79}] (* Michael De Vlieger, Aug 19 2017 *) CROSSREFS Cf. A141331, A141332, A141333, A141334, A141335. Sequence in context: A078943 A063733 A187089 * A239324 A114375 A198503 Adjacent sequences:  A141327 A141328 A141329 * A141331 A141332 A141333 KEYWORD nonn,look AUTHOR Leroy Quet, Jun 25 2008 EXTENSIONS More terms from Diana L. Mecum, Jul 14 2008 STATUS approved

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Last modified October 17 08:36 EDT 2019. Contains 328107 sequences. (Running on oeis4.)