%I A066848
%S A066848 1,2,3,2436,520,60,308,2436,15867,61800,8096,55620,77077,20216,51675,2296992,
               21607,15867,185820,481680,140805,226644,145866,1568928,1076000,187772,
               5596587,1831956,715778,3540060,
%T A066848 836535,2296992,3088008,1129514,7096775,1995048,2018646,3159168,13019136,
               15293320,6936667,11250624,6877463,20475136,3380040,3986360,1052424,
               17566608,5152350,1076000,3824694,8897564,
%U A066848 2987239,17600004,24056230,89537336,23397531,2791424,5393780,19344660,
               5306268,8679008,126415359,30486400,29303235
%N A066848 Consider sequence of fractions A066657/A066658 produced by ratios of 
               terms in A066720; let m = smallest integer so that all fractions 
               1/n, 2/n, ..., (n-1)/n have appeared when we reach A066720(m) = k; 
               sequence gives values of k; set a(n) = -1 if some fraction i/n never 
               appears.
%e A066848 3/4 does not occur until we reach A066720(401) = 2436 and then we see 
               A066720(320)/A066720(401) = 1827/2436 = 3/4. Therefore a(4) = 2436.
%Y A066848 Cf. A066720, A066657, A066658. A066849 gives values of m.
%Y A066848 Sequence in context: A097549 A004909 A137321 this_sequence A125612 A038104 
               A097301
%Y A066848 Adjacent sequences: A066845 A066846 A066847 this_sequence A066849 A066850 
               A066851
%K A066848 nonn,nice
%O A066848 1,2
%A A066848 N. J. A. Sloane (njas(AT)research.att.com), Jan 21 2002
%E A066848 Corrected by John Layman, Feb 05 2002.
%E A066848 Greatly extended by David Applegate (david(AT)research.att.com), Feb 
               13, 2002.