%I A003139 M0129
%S A003139 1,1,1,1,2,1,3,1,3,2,9,1,10,2,4,3,19,1,20,2,6,4,32,1,21,7,16,7,84,1,85,
               9,
%T A003139 18,11,35,3,161,15,30,6,212,2,214,15,12,19,260,3,154,11,62,31,521,5,129
%N A003139 Coprime chains with largest member n.
%D A003139 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%D A003139 R. C. Entringer, The number of coprime chains with largest member n, 
               Proc. Amer. Math. Soc., 16 (1965), 806-810.
%Y A003139 Cf. A003140.
%Y A003139 Sequence in context: A162912 A039776 A048864 this_sequence A145652 A111248 
               A100714
%Y A003139 Adjacent sequences: A003136 A003137 A003138 this_sequence A003140 A003141 
               A003142
%K A003139 nonn,nice
%O A003139 1,5
%A A003139 N. J. A. Sloane (njas(AT)research.att.com).