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0, 1, 4, 0, 7, 7, 0, 4, 1, 0, 1, 4, 0, 7, 7, 0, 4, 1, 0, 1, 4, 0, 7, 7, 0, 4, 1, 0, 1, 4, 0, 7, 7, 0, 4, 1, 0, 1, 4, 0, 7, 7, 0, 4, 1, 0, 1, 4, 0, 7, 7, 0, 4, 1, 0, 1, 4, 0, 7, 7, 0, 4, 1, 0, 1, 4, 0, 7, 7, 0, 4, 1, 0, 1, 4, 0, 7, 7, 0, 4, 1, 0, 1, 4, 0, 7, 7, 0, 4, 1, 0, 1, 4, 0, 7, 7, 0, 4, 1, 0, 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 (0,0,0,0,0,0,0,0,1). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 20 2010]
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FORMULA
| a(n) = +a(n-9). G.f.: ( -x*(1+x)*(x^6+3*x^5-3*x^4+10*x^3-3*x^2+3*x+1) ) / ( (x-1)*(1+x+x^2)*(x^6+x^3+1) ). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 20 2010]
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MATHEMATICA
| Table[Mod[n^2, 9], {n, 0, 200}] (* From Vladimir Joseph Stephan Orlovsky, Apr 21 2011 *)
PowerMod[Range[0, 200], 2, 9] (* From Harvey P. Dale, June 11 2011 *)
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PROG
| (PARI) a(n)=[0, 1, 4, 0, 7, 7, 0, 4, 1][n%9+1] \\ Charles R Greathouse IV, Jun 11 2011
(PARI) a(n)=n^2%9 \\ Charles R Greathouse IV, Jun 11 2011
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CROSSREFS
| Cf. A070430, A070431, A053879.
Sequence in context: A133930 A077892 A117543 * A169821 A170990 A013666
Adjacent sequences: A070430 A070431 A070432 * A070434 A070435 A070436
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KEYWORD
| nonn,easy
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), May 12 2002
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