Search: id:A000379
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%I A000379 M4065 N1685
%S A000379 1,6,8,10,12,14,15,18,20,21,22,26,27,28,32,33,34,35,36,38,39,44,45,46,
               48,
%T A000379 50,51,52,55,57,58,62,63,64,65,68,69,74,75,76,77,80,82,85,86,87,91,92,
               93,
%U A000379 94,95,98,99,100,106,111,112,115,116,117,118,119,120,122,123,124,125,129
%N A000379 A 2-way classification of integers: complement of A000028.
%C A000379 This sequence and A000028 (its complement) give the unique solution to 
               the problem of splitting the positive integers into two classes in 
               such a way that products of pairs of distinct elements from either 
               class occur with the same multiplicities [Lambek and Moser]. Cf. 
               A000069, A001969.
%C A000379 See A000028 for precise definition, Maple program, etc.
%D A000379 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%D A000379 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 
               (includes this sequence).
%D A000379 J. Lambek and L. Moser, On some two way classifications of integers, 
               Canad. Math. Bull. 2 (1959), 85-89.
%D A000379 J. Roberts, Lure of the Integers, Math. Assoc. America, 1992, p. 22.
%H A000379 N. J. A. Sloane, <a href="b000379.txt">Table of n, a(n) for n=1..10000</
               a>
%Y A000379 Cf. A133008, A000028 (complement), A000201, A001950. Different from A123240 
               (e.g. does not contain 180).
%Y A000379 Sequence in context: A123240 A131181 A064176 this_sequence A065985 A060652 
               A020739
%Y A000379 Adjacent sequences: A000376 A000377 A000378 this_sequence A000380 A000381 
               A000382
%K A000379 nonn,easy,nice
%O A000379 1,2
%A A000379 N. J. A. Sloane (njas(AT)research.att.com).
%E A000379 Edited by N. J. A. Sloane (njas(AT)research.att.com), Dec 20 2007, to 
               restore the original definition.

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