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A070512
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a(n) = n^4 mod 7.
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2
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0, 1, 2, 4, 4, 2, 1, 0, 1, 2, 4, 4, 2, 1, 0, 1, 2, 4, 4, 2, 1, 0, 1, 2, 4, 4, 2, 1, 0, 1, 2, 4, 4, 2, 1, 0, 1, 2, 4, 4, 2, 1, 0, 1, 2, 4, 4, 2, 1, 0, 1, 2, 4, 4, 2, 1, 0, 1, 2, 4, 4, 2, 1, 0, 1, 2, 4, 4, 2, 1, 0, 1, 2, 4, 4, 2, 1, 0, 1, 2, 4, 4, 2, 1, 0, 1, 2, 4, 4, 2, 1, 0, 1, 2, 4, 4, 2, 1, 0, 1, 2
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OFFSET
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0,3
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COMMENTS
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LINKS
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FORMULA
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a(n) = a(n-7).
G.f.: x*(1 +2*x +4*x^2 +2*x^4 + x^5)/(1 - x^7).
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MATHEMATICA
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PROG
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(Sage) [power_mod(n, 4, 7)for n in range(0, 101)] # Zerinvary Lajos, Oct 30 2009
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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