%I A013930
%S A013930 1,2,3,4,5,7,9,11,13,15,17,19,20,23,25,26,27,29,32,34,37,40,41,42,43,44,
%T A013930 46,47,49,50,51,53,54,56,58,60,61,63,64,65,69,70,71,74,76,77,79,80,81,
               82,
%U A013930 83,84,86,88,89,90,92,94,95,96,98,100,102,103,104,106,107,108,110,111
%N A013930 Sum of first a(n) square-frees is square-free.
%Y A013930 Cf. A005117, A013931, A013932.
%Y A013930 Sequence in context: A045782 A064005 A026285 this_sequence A004281 A004276 
               A033057
%Y A013930 Adjacent sequences: A013927 A013928 A013929 this_sequence A013931 A013932 
               A013933
%K A013930 nonn
%O A013930 1,2
%A A013930 Henri Lifchitz (100637.64(AT)CompuServe.COM)
%E A013930 More terms from David W. Wilson (davidwwilson(AT)comcast.net)