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A070421
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a(n) = 7^n mod 38.
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1
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1, 7, 11, 1, 7, 11, 1, 7, 11, 1, 7, 11, 1, 7, 11, 1, 7, 11, 1, 7, 11, 1, 7, 11, 1, 7, 11, 1, 7, 11, 1, 7, 11, 1, 7, 11, 1, 7, 11, 1, 7, 11, 1, 7, 11, 1, 7, 11, 1, 7, 11, 1, 7, 11, 1, 7, 11, 1, 7, 11, 1, 7, 11, 1, 7, 11, 1, 7, 11, 1, 7, 11, 1, 7, 11, 1, 7, 11, 1, 7, 11, 1, 7, 11, 1, 7, 11, 1, 7, 11
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OFFSET
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0,2
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COMMENTS
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Period 3: repeat [1, 7, 11].
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LINKS
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FORMULA
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a(n) = a(n-3) for n>2.
G.f.: ( 1+7*x+11*x^2 ) / ( (1-x)*(1+x+x^2) ). (End)
a(n) = (19 - 16*cos(2*n*Pi/3) - 4*sqrt(3)*sin(2*n*Pi/3))/3. - Wesley Ivan Hurt, Jun 29 2016
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MAPLE
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MATHEMATICA
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PROG
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(Sage) [power_mod(7, n, 19) for n in range(0, 90)] # or:
(Magma) [Modexp(7, n, 19): n in [0..100]]; // Bruno Berselli, Mar 22 2016
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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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