%I A005837 M0621
%S A005837 1,2,3,5,6,8,9,10,15,16,17,19,26,27,29,30,31,34,37,49,50,51,53,54,56,57,
%T A005837 58,63,65,66,67,80,87,88,89,91,94,99,102,105,106,109,110,111,122,126,136,
%U A005837 145,149,151,152,160,163,167,169,170,171,174,176,177,183,187,188,194,196
%N A005837 Sequence contains no 4-term arithmetic progression.
%D A005837 J. L. Gerver and L. T. Ramsey, Sets of integers with no long arithmetic 
               progressions generated by the greedy algorithm, Math. Comp., 33 (1979), 
               1353-1359.
%D A005837 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%Y A005837 Sequence in context: A167389 A087067 A166018 this_sequence A098161 A026194 
               A102420
%Y A005837 Adjacent sequences: A005834 A005835 A005836 this_sequence A005838 A005839 
               A005840
%K A005837 nonn
%O A005837 0,2
%A A005837 N. J. A. Sloane (njas(AT)research.att.com), Jeffrey Shallit