A333108 a(n) = floor(n*sin(n)*cos(n)).

0, 0, -1, -1, 1, -2, -2, 3, -2, -4, 4, -1, -6, 4, 1, -8, 4, 4, -9, 2, 7, -10, 0, 10, -10, -4, 12, -8, -8, 14, -5, -12, 14, -1, -16, 13, 4, -19, 10, 10, -20, 6, 15, -20, 0, 20, -18, -6, 23, -15, -13, 25, -9, -20, 25, -2, -25, 22, 6, -29, 17, 15, -31, 10, 23, -31, 1, 29

Offset

0,6

Comments

The sequence of indices of zeros begins: 0, 1, 22, 44, 355, 710, 1065, 1420, 1775, 2130, 2485, 2840, 3195, 260515, 312689.

Links

David A. Corneth, Table of n, a(n) for n = 0..9999

Mathematica

Table[Floor[n Sin[n] Cos[n]], {n, 0, 80}] (* Harvey P. Dale, Feb 10 2022 *)

Prog

(Python)
import math, matplotlib.pyplot as plt
x = [n for n in range(5000)]
y = [int(math.floor(n*math.cos(n)*math.sin(n))) for n in x]
print(y)
plt.show(plt.scatter(x, y, s=5))
(Magma) [Floor(n*Sin(n)*Cos(n)) : n in [0..80]]; // Wesley Ivan Hurt, Aug 19 2022

Crossrefs

Cf. A105662, A105663.

Sequence in context: A240089 A218700 A325331 * A266935 A175012 A051693

Adjacent sequences: A333105 A333106 A333107 * A333109 A333110 A333111

Keyword

sign,easy,look

Author

Alex Ratushnyak, Mar 07 2020

Status

approved