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A089290
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Digital root of floor(Pi*10^n), Pi=3.14....
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3
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3, 4, 8, 9, 5, 5, 7, 4, 9, 3, 8, 7, 7, 5, 5, 8, 1, 4, 3, 7, 4, 6, 3, 7, 1, 4, 3, 6, 8, 6, 6, 2, 2, 4, 3, 2, 6, 7, 7, 5, 6, 3, 3, 6, 6, 6, 9, 7, 3, 4, 4, 9, 8, 1, 1, 1, 8, 3, 3, 7, 2, 7, 7, 9, 3, 3, 1, 9, 1, 7, 2, 2, 8, 1, 9, 6, 8, 8, 7, 7, 7, 6, 3, 5, 4, 4, 7
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OFFSET
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0,1
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LINKS
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FORMULA
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EXAMPLE
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n=10: floor(Pi*10^n) = 31415926535 -> 3 + 1 + 4 + 1 + 5 + 9 + 2 + 6 + 5 + 3 + 5 = 44 -> 4 + 4 = 8, so a(10)=8.
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MAPLE
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MATHEMATICA
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Table[ Mod[ Floor[ Pi*10^n], 9], {n, 0, 104}] /. 0 -> 9 (* Robert G. Wilson v, Oct 31 2003 *)
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CROSSREFS
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KEYWORD
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nonn,easy,base
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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