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A154411
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a(n) = period of the sequence x[n+1] := floor(2 cos(2 pi/7) x[n]) - x[n-1], with x[0] := cosh(k)^2, x[1]:= sinh[k]^2.
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0
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8, 56, 996, 1680, 5236, 280, 28, 224, 448, 749196, 728, 980, 420, 112, 1708, 56, 112, 56, 308, 252, 532, 84, 2156, 28, 84, 280, 29260, 140, 6454336, 3220
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