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A177738
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a(n) = floor( (x^n - x^(-n)) / (x - x^(-1)) ) where x = Pi-2.
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1
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0, 1, 2, 3, 4, 5, 6, 8, 9, 11, 13, 15, 17, 20, 23, 26, 30, 35, 40, 46, 52, 60, 69, 78, 90, 103, 117, 134, 153, 175, 199, 228, 260, 297, 339, 387, 442, 505, 576, 658, 751, 858, 979, 1118, 1277, 1457, 1664, 1900, 2169, 2476, 2826
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OFFSET
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0,3
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COMMENTS
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The ratio a(n+1)/a(n) approaches Pi-2 as n approaches infinity, and is lower than even Salem polynomial expansions based on A073011.
The idea is the emulation of quadratic beta integer domains using a transcendental number base with a ratio below A073011.
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LINKS
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MATHEMATICA
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Clear[a, n, b]; b = Pi - 2; a[n_] = (b^n - b^(-n))/(b - b^(-1));
Table[Floor[a[n]], {n, 0, 50}]
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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Undefined terminology removed from the definition - The Assoc. Eds. of the OEIS, May 14 2010
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STATUS
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approved
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