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A134301
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Periodic sequence (0, 2, 6, 2, 0).
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0
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0, 2, 6, 2, 0, 0, 2, 6, 2, 0, 0, 2, 6, 2, 0, 0, 2, 6, 2, 0, 0, 2, 6, 2, 0, 0, 2, 6, 2, 0, 0, 2, 6, 2, 0, 0, 2, 6, 2, 0, 0, 2, 6, 2, 0, 0, 2, 6, 2, 0, 0, 2, 6, 2, 0, 0, 2, 6, 2, 0, 0, 2, 6, 2, 0
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OFFSET
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0,2
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COMMENTS
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Also: twice the partial sums of A117444. - R. J. Mathar, Feb 01 2008
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REFERENCES
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Rozsa Peter, Leon Harkleroad, Mathematics is Beautiful, Math. Intellig., 12 (No. 1, 1990), 58-64.
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LINKS
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Table of n, a(n) for n=0..64.
Index entries for linear recurrences with constant coefficients, signature (0,0,0,0,1).
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FORMULA
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a(n) = n(n+1) mod 10
O.g.f.: -2/(x-1)+(2*x^3+2*x^2-2*x-2)/(1+x+x^2+x^3+x^4). a(n)=a(n-5). - R. J. Mathar, Feb 01 2008
a(n)=(1/5)*{(n mod 5)+3*[(n+1) mod 5]+5*[(n+2) mod 5]-3*[(n+3) mod 5]-[(n+4) mod 5]}, with n>=0 - Paolo P. Lava, Feb 05 2008
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MATHEMATICA
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PadRight[{}, 70, {0, 2, 6, 2, 0}] (* Harvey P. Dale, Mar 22 2012 *)
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PROG
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(PARI) a(n)=[0, 2, 6, 2, 0][n%5+1] \\ Charles R Greathouse IV, Jul 13 2016
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CROSSREFS
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Sequence in context: A117214 A185972 A182918 * A168294 A004544 A010590
Adjacent sequences: A134298 A134299 A134300 * A134302 A134303 A134304
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KEYWORD
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nonn,easy
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AUTHOR
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Franz Vrabec, Jan 30 2008
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STATUS
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approved
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