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0, 1, 4, 2, 2, 4, 1, 0, 1, 4, 2, 2, 4, 1, 0, 1, 4, 2, 2, 4, 1, 0, 1, 4, 2, 2, 4, 1, 0, 1, 4, 2, 2, 4, 1, 0, 1, 4, 2, 2, 4, 1, 0, 1, 4, 2, 2, 4, 1, 0, 1, 4, 2, 2, 4, 1, 0, 1, 4, 2, 2, 4, 1, 0, 1, 4, 2, 2, 4, 1, 0, 1, 4, 2, 2, 4, 1, 0, 1, 4, 2, 2, 4, 1, 0, 1, 4, 2, 2, 4, 1, 0, 1, 4, 2, 2, 4, 1, 0, 1, 4, 2, 2, 4, 1
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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LINKS
| Index to sequences with linear recurrences with constant coefficients, signature (0,0,0,0,0,0,1).
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FORMULA
| Periodic with period 7.
a(n)=1/21*{5*(n mod 7)+11*[(n+1) mod 7]-4*[(n+2) mod 7]+2*[(n+3) mod 7]+8*[(n+4) mod 7]-7*[(n+5) mod 7]-[(n+6) mod 7]} with n>=0 - Paolo P. Lava (paoloplava(AT)gmail.com), Nov 27 2006
G.f. -x*(1+x)*(x^4+3*x^3-x^2+3*x+1) / ( (x-1)*(1+x+x^2+x^3+x^4+x^5+x^6) ). - R. J. Mathar, Feb 24 2011
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MATHEMATICA
| Table[Mod[n^2, 7], {n, 0, 200}] (* From Vladimir Joseph Stephan Orlovsky, Apr 21 2011 *)
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CROSSREFS
| Cf. A070430, A070431.
Sequence in context: A140395 A061505 A197154 * A170988 A141035 A100854
Adjacent sequences: A053876 A053877 A053878 * A053880 A053881 A053882
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KEYWORD
| nonn
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AUTHOR
| Stuart M. Ellerstein (ellerstein(AT)aol.com), Apr 01 2000
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EXTENSIONS
| More terms from James A. Sellers (sellersj(AT)math.psu.edu), Apr 08 2000
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