Search: id:A087001
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%I A087001
%S A087001 142,9,769,58823529,526315789,43478260869,34482758620689,
%T A087001 21276595744680851063829,16949152542372881355932203389,
%U A087001 163934426229508196721311475409,1369,1123595505617977528089
%N A087001 Left half of periodic part of decimal expansion of 1/p for those primes 
               having a periodic part of even length.
%C A087001 a(n) = floor(A086999(n)/10^A087000(n)); A055642(a(n))=A087000(n);
%C A087001 a(n) + A087002(n) = 10^A087000(n) - 1.
%D A087001 H. Rademacher and O. Toeplitz, Von Zahlen und Figuren (Springer 1930, 
               reprinted 1968), ch. 19, Die periodischen Dezimalbrueche.
%H A087001 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               MidysTheorem.html">Midy's Theorem</a>
%H A087001 <a href="Sindx_1.html#1overn">Index entries for sequences related to 
               decimal expansion of 1/n.</a>
%e A087001 p=17: A086999(4)=5882352941176470 -> [58823529][41176470] ->
%e A087001 A087001(4)=58823529, A087002(4)=41176470,
%e A087001 A087001(4)+A087002(4)=58823529+41176470=99999999.
%Y A087001 Sequence in context: A164525 A153358 A066627 this_sequence A025379 A035702 
               A029703
%Y A087001 Adjacent sequences: A086998 A086999 A087000 this_sequence A087002 A087003 
               A087004
%K A087001 nonn,base
%O A087001 1,1
%A A087001 Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jul 29 2003

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