Search: id:A131707
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%I A131707
%S A131707 1,1,3,7,7,1,9,9,7,3,3,9,1,1,3,7,7,1,9,9,7,3,3,9,1,1,3,7,7,1,9,9,7,3,3,
%T A131707 9,1,1,3,7,7,1,9,9,7,3,3,9,1,1,3,7,7,1,9,9,7,3,3,9,1,1,3,7,7,1,9,9,7,3,
%U A131707 3,9,1,1,3,7,7,1,9,9,7,3,3,9,1,1,3,7,7,1,9,9,7,3,3,9,1,1,3,7,7,1,9,9,7
%N A131707 Period 12: repeat 1, 1, 3, 7, 7, 1, 9, 9, 7, 3, 3, 9 .
%C A131707 Also the decimal expansion of 1023949/9000009. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), 
               Feb 07 2009]
%F A131707 a(n)=(1/66)*{49*(n mod 12)-28*[(n+1) mod 12]+5*[(n+2) mod 12]+27*[(n+3) 
               mod 12]+16*[(n+4) mod 12]+5*[(n+5) mod 12]-39*[(n+6) mod 12]+38*[(n+7) 
               mod 12]+5*[(n+8) mod 12]-17*[(n+9) mod 12]-6*[(n+10) mod 12]+5*[(n+11) 
               mod 12]}, with n>=0 - Paolo P. Lava (ppl(AT)spl.at), Oct 02 2007
%F A131707 G.f.: (1+2x^2+4x^3-6x^5+9x^6)/((1-x)(1+x^2)(1-x^2+x^4)). a(n)=a(n-1)-a(n-6)+a(n-7). 
               [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 07 2009]
%Y A131707 Cf. A131711.
%Y A131707 Sequence in context: A013564 A009467 A131608 this_sequence A016620 A021269 
               A021730
%Y A131707 Adjacent sequences: A131704 A131705 A131706 this_sequence A131708 A131709 
               A131710
%K A131707 nonn,easy
%O A131707 0,3
%A A131707 Paul Curtz (bpcrtz(AT)free.fr), Sep 14 2007
%E A131707 More terms from Tracy Poff (tracy.poff(AT)gmail.com), Dec 21 2008
%E A131707 Even more periods from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 
               07 2009

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