%I A005839 M0956
%S A005839 0,1,2,4,5,7,8,9,14,15,16,18,25,26,28,29,30,33,36,48,49,50,52,
%T A005839 53,55,56,57,62,64,65,66,79,86,87,88,90,93,98,101,104,105,108,109,
%U A005839 110,121,125,135,144,148,150,151,159,162,166,168,169,170,173,175
%N A005839 Sequence contains no 4-term arithmetic progression.
%D A005839 R. K. Guy, Unsolved Problems in Number Theory, E10.
%D A005839 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%Y A005839 Sequence in context: A039046 A026451 A050106 this_sequence A062102 A092289 
               A079358
%Y A005839 Adjacent sequences: A005836 A005837 A005838 this_sequence A005840 A005841 
               A005842
%K A005839 nonn
%O A005839 0,3
%A A005839 N. J. A. Sloane (njas(AT)research.att.com).
%E A005839 more terms from Jeffrey Shallit, 8/95.