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A131030
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Period 6: repeat [16, 7, 7, 16, 25, 25].
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10
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16, 7, 7, 16, 25, 25, 16, 7, 7, 16, 25, 25, 16, 7, 7, 16, 25, 25, 16, 7, 7, 16, 25, 25, 16, 7, 7, 16, 25, 25, 16, 7, 7, 16, 25, 25, 16, 7, 7, 16, 25, 25, 16, 7, 7, 16, 25, 25, 16, 7, 7, 16, 25, 25, 16, 7, 7, 16, 25, 25, 16, 7, 7, 16, 25, 25, 16, 7, 7, 16, 25, 25, 16, 7, 7, 16, 25, 25, 16
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OFFSET
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1,1
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COMMENTS
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Sixth column of triangular array T defined in A131022.
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LINKS
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FORMULA
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a(1) = a(4) = 16, a(2) = a(3) = 7, a(5) = a(6) = 25; for n > 6, a(n) = a(n-6).
G.f.: x*(16 - 25*x + 25*x^2)/((1-x)*(1 - x + x^2)).
a(n) = 16 + 9*cos(n*Pi/3) - 3*sqrt(3)*sin(n*Pi/3). - Wesley Ivan Hurt, Sep 26 2018
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MAPLE
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PROG
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(PARI) {m=79; for(n=1, m, r=(n-1)%6; print1(if(r==0||r==3, 16, if(r==1||r==2, 7, 25)), ", "))}
(Magma) m:=79; [ [16, 7, 7, 16, 25, 25][(n-1) mod 6 + 1]: n in [1..m] ];
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CROSSREFS
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KEYWORD
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nonn,easy,changed
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AUTHOR
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STATUS
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approved
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