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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
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| Also: twice the partial sums of A117444. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 01 2008
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REFERENCES
| Rozsa Peter, Leon Harkleroad, Mathematics is Beautiful, Math. Intellig., 12 (No. 1, 1990), 58-64.
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FORMULA
| 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 (mathar(AT)strw.leidenuniv.nl), 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 (paoloplava(AT)gmail.com), Feb 05 2008
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CROSSREFS
| Sequence in context: A117214 A185972 A182918 * A168294 A004544 A010590
Adjacent sequences: A134298 A134299 A134300 * A134302 A134303 A134304
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KEYWORD
| nonn
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AUTHOR
| Franz Vrabec (franz.vrabec(AT)aon.at), Jan 30 2008
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