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A165669
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First digit of the decimal expansion of (n^2+2)/7 after the decimal point.
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0
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2, 4, 8, 5, 5, 8, 4, 2, 4, 8, 5, 5, 8, 4, 2, 4, 8, 5, 5, 8, 4, 2, 4, 8, 5, 5, 8, 4, 2, 4, 8, 5, 5, 8, 4, 2, 4, 8, 5, 5, 8, 4, 2, 4, 8, 5, 5, 8, 4, 2, 4, 8, 5, 5, 8, 4, 2, 4, 8, 5, 5, 8, 4, 2, 4, 8, 5, 5, 8, 4, 2, 4, 8, 5, 5, 8, 4, 2, 4, 8, 5, 5, 8, 4, 2, 4, 8, 5, 5, 8, 4, 2, 4, 8, 5, 5, 8, 4, 2, 4, 8, 5, 5, 8, 4
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OFFSET
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0,1
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COMMENTS
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Periodic with period length 7.
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LINKS
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FORMULA
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a(n) = floor(10*(n^2+2)/7) mod 10. [R. J. Mathar, Sep 23 2009]
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EXAMPLE
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For n=0, (0^2+2)/7=0.285.... and 2 is the first digit after the point.
For n=1, (1^2+2)/7=0.4285..., and 4 is the first digit after the point.
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MATHEMATICA
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Table[Mod[Floor[10*N[(n^2+2)/7]], 10], {n, 0, 110}] (* Harvey P. Dale, Jul 05 2015 *)
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CROSSREFS
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KEYWORD
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nonn,base,easy,less
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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