%I A076786
%S A076786 1,2,3,5,6,7,10,11,13,14,15,17,19,21,22,23,26,29,30,31,33,34,35,37,38,
%T A076786 39,51,53,55,57,58,59,61,62,65,66,67,69,70,71,73,74,77,78,79,101,102,
%U A076786 103,105,106,107,109,110,111,113,114,115,118,119,130,131,133,134,137
%N A076786 Square-free numbers such that in decimal representation all their prefixes 
               are also square-free.
%C A076786 m is a term iff A008966(floor(m/10^k))=1 for 0<=k<=A004216(n);
%C A076786 a(n)=A005117(n) for n<=26, but A005117(27)=41 is not a term, as 4=2^2 
               is not square-free.
%e A076786 143=11*13 is a term, as also 14=2*7 and 1 are square-free.
%Y A076786 Sequence in context: A005117 A144338 A077377 this_sequence A167171 A087008 
               A077337
%Y A076786 Adjacent sequences: A076783 A076784 A076785 this_sequence A076787 A076788 
               A076789
%K A076786 nonn,base
%O A076786 1,2
%A A076786 Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Nov 16 2002