Search: id:A140724
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%I A140724
%S A140724 1,5,9,7,7,9,5,1,3,3,1,5,9,7,7,9,5,1,3,3,1,5,9,7,7,9,5,1,3,3,1,5,9,7,7,
%T A140724 9,5,1,3,3,1,5,9,7,7,9,5,1,3,3,1,5,9,7,7,9,5,1,3,3,1,5,9,7,7,9,5,1,3,3,
%U A140724 1,5,9,7,7,9,5,1,3,3,1,5,9,7,7,9,5,1,3,3,1,5,9,7,7,9,5,1,3,3,1,5,9,7,7
%N A140724 Period 10: 1, 5, 9, 7, 7, 9, 5, 1, 3, 3 repeated.
%C A140724 The last digit of A108981(n).
%C A140724 Also the continued fraction of (290003+sqrt(240183699293))/652402.
%C A140724 Also the decimal expansion of 13073/81819.
%C A140724 The period contains each of the the 5 odd digits twice.
%F A140724 a(n)+a(n+5) = 10 = A010692(n).
%F A140724 a(n) = a(n+10) .
%F A140724 a(10*k+9+i) = a(10*k+18-i) (palindromic).
%F A140724 a(n) = 2*a(n-1)-2*a(n-2)+2*a(n-3)-2*a(n-4)+a(n-5). G.f.: -(1+3*x+x^2-3*x^3+3*x^4)/ 
               ((x-1) * (x^4-x^3+x^2-x+1)).
%F A140724 a(n)=(1/45)*{14*(n mod 10)+5*[(n+1) mod 10]-4*[(n+2) mod 10]+23*[(n+3) 
               mod 10]+23*[(n+4) mod 10]-4*[(n+5) mod 10]+5*[(n+6) mod 10]+14*[(n+7) 
               mod 10]-13*[(n+8) mod 10]-13*[(n+9) mod 10]}, with n>=0 - Paolo P. 
               Lava (ppl(AT)spl.at), Jul 14 2008
%Y A140724 Sequence in context: A118309 A100106 A125650 this_sequence A086055 A077125 
               A160050
%Y A140724 Adjacent sequences: A140721 A140722 A140723 this_sequence A140725 A140726 
               A140727
%K A140724 nonn,easy
%O A140724 0,2
%A A140724 Paul Curtz (bpcrtz(AT)free.fr), Jul 12 2008
%E A140724 Edited by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 07 2009

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