%I A013931
%S A013931 1,2,3,5,6,10,13,15,19,22,26,30,31,35,38,39,41,43,51,55,59,65,66,67,69,
%T A013931 70,73,74,78,79,82,85,86,89,93,95,97,102,103,105,110,111,113,118,122,123,
%U A013931 129,130,131,133,134,137,139,142,143,145,149,154,155,157,159,163,166,167
%N A013931 a(n) is square-free and sum of all square-frees <= a(n) is square-free.
%Y A013931 Cf. A005117, A013930, A013932.
%Y A013931 Sequence in context: A097071 A105420 A058641 this_sequence A018429 A035953 
               A087750
%Y A013931 Adjacent sequences: A013928 A013929 A013930 this_sequence A013932 A013933 
               A013934
%K A013931 nonn
%O A013931 1,2
%A A013931 Henri Lifchitz (100637.64(AT)CompuServe.COM)
%E A013931 More terms from David W. Wilson (davidwwilson(AT)comcast.net)