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 A120323 Periodic sequence 0, 3, 1, 0, 1, 3. 0
 0, 3, 1, 0, 1, 3, 0, 3, 1, 0, 1, 3, 0, 3, 1, 0, 1, 3, 0, 3, 1, 0, 1, 3, 0, 3, 1, 0, 1, 3, 0, 3, 1, 0, 1, 3, 0, 3, 1, 0, 1, 3, 0, 3, 1, 0, 1, 3, 0, 3, 1, 0, 1, 3, 0, 3, 1, 0, 1, 3, 0, 3, 1, 0, 1, 3, 0, 3, 1, 0, 1, 3, 0, 3, 1, 0, 1, 3, 0 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS FORMULA a(n)=(4/3)*((sin(n*Pi/6)+sin(n*Pi/2))^2, with n>=0 EXAMPLE n=0 (4/3)*(sin(0)+sin(0))^2 = 0. n=1 (4/3)*(sin(Pi/6)+sin(Pi/2))^2 = (4/3)*(1/2+1)^2 = (4/3)*(9/4) = 3. n=2 (4/3)*(sin(Pi/3)+sin(Pi))^2 = (4/3)*(((3)^.5)/2+0)^2 = (4/3)*(3/4) = 1. n=3 (4/3)*(sin(Pi/2)+sin(3*Pi/2))^2 = (4/3)*(1-1)^2 = 0. n=4 (4/3)*(sin(2*Pi/3)+sin(2*Pi))^2 = (4/3)*(((3)^.5)/2+0)^2 = (4/3)*(3/4) = 1. n=5 (4/3)*(sin(5*Pi/6)+sin(5*Pi/2)^2 = (4/3)*(1/2+1)^2 = (4/3)*(9/4) = 3. MAPLE P:=proc(n) local i, j; for i from 0 by 1 to n do j:=4/3*(sin(i*Pi/6)+sin(i*Pi/2))^2; print(j); od; end: P(20); CROSSREFS Sequence in context: A308243 A268386 A122779 * A320476 A304326 A099905 Adjacent sequences:  A120320 A120321 A120322 * A120324 A120325 A120326 KEYWORD easy,nonn AUTHOR Paolo P. Lava and Giorgio Balzarotti, Jun 21 2006 STATUS approved

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Last modified September 18 03:09 EDT 2021. Contains 347504 sequences. (Running on oeis4.)