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Search: id:A135449
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| A135449 |
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Period 5: repeat 1, 9, -7, 3, 5. |
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+0
1
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| 1, 9, -7, 3, 5, 1, 9, -7, 3, 5, 1, 9, -7, 3, 5, 1, 9, -7, 3, 5, 1, 9, -7, 3, 5, 1, 9, -7, 3, 5, 1, 9, -7, 3, 5, 1, 9, -7, 3, 5, 1, 9, -7, 3, 5, 1, 9, -7, 3, 5, 1, 9, -7, 3, 5, 1, 9, -7, 3, 5, 1, 9, -7, 3, 5, 1, 9, -7, 3, 5, 1, 9, -7, 3, 5, 1, 9, -7, 3, 5, 1, 9, -7, 3, 5, 1, 9, -7, 3, 5, 1, 9, -7, 3, 5, 1
(list; graph; listen)
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OFFSET
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0,2
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FORMULA
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a(n) == 9a(n-1) mod 11.
a(n)=(1/50)*{51*(n mod 5)-9*[(n+1) mod 5]-89*[(n+2) mod 5]+171*[(n+3) mod 5]-69*[(n+4) mod 5]}, with n>=0. - Paolo P. Lava (ppl(AT)spl.at), Dec 18 2007
O.g.f.: -(1+9*x-7*x^2+3*x^3+5*x^4)/[(x-1)*(1+x+x^2+x^3+x^4)] . - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 07 2008
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MAPLE
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A135449 := proc(n) op((n mod 5)+1, [1, 9, -7, 3, 5]) ; end: seq(A135449(n), n=0..150) ; [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 07 2009]
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CROSSREFS
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Sequence in context: A091558 A002205 A033873 this_sequence A060388 A081821 A164102
Adjacent sequences: A135446 A135447 A135448 this_sequence A135450 A135451 A135452
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KEYWORD
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sign
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AUTHOR
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Paul Curtz (bpcrtz(AT)free.fr), Dec 14 2007
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EXTENSIONS
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More periods from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 07 2009
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