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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
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| Equivalently 7^n mod 19. [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Nov 27 2009]
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LINKS
| Index to sequences with linear recurrences with constant coefficients, signature (0,0,1).
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FORMULA
| a(n) = +a(n-3). G..f: ( -1-7*x-11*x^2 ) / ( (x-1)*(1+x+x^2) ). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 20 2010]
a(n)=(1/9)*{49*(n mod 3)+7*[(n+1) mod 3]+[(n+2) mod 3]}, with n>=0 [From Paolo P. Lava (paoloplava(AT)gmail.com), May 14 2010]
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PROG
| (Other) sage: [power_mod(7, n, 19)for n in xrange(0, 90)] # and sage: [power_mod(7, n, 38)for n in xrange(0, 90)] # [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Nov 27 2009]
(MAGMA)[7^n mod 19: n in [0..80]]; // From Vincenzo Librandi, Feb 08 2011
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CROSSREFS
| Sequence in context: A133346 A091920 A036934 * A050081 A144076 A097152
Adjacent sequences: A070418 A070419 A070420 * A070422 A070423 A070424
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), May 12 2002
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