%I A117811
%S A117811 1,1,2,1,3,1,1,2,5,1,6,1,7,1,2,2,1,3,10,1,11,1,3,2,13,1,14,1,15,1,1,
%T A117811 4,17,1,2,3,19,1,5,2,21,1,22,1,23,1,6,2,1,5,26,1,3,3,7,2,29,1,30,1,
%U A117811 31,1,2,4,33,1,34,1,35,1,1,6,37,1,38,1,39,1,10,2,41,1,42,1,43,1,11
%N A117811 Two-column table read by rows: row n (n >= 1) gives a squarefree integer 
               x and an integer y such that n = x*y^2.
%e A117811 Table begins:
%e A117811 1 1
%e A117811 2 1
%e A117811 3 1
%e A117811 1 2 (so 4 = 1*2^2)
%e A117811 5 1
%e A117811 6 1
%e A117811 7 1
%e A117811 2 2 (so 8 = 2*2^2)
%e A117811 1 3
%e A117811 10 1
%e A117811 11 1
%e A117811 3 2
%e A117811 13 1
%e A117811 14 1
%e A117811 15 1
%e A117811 1 4
%o A117811 (MAGMA) at:=0; for n in [1..100] do print Squarefree(n); end for;
%Y A117811 The two columns are A007913, A000188.
%Y A117811 Sequence in context: A070099 A126760 A007740 this_sequence A051793 A065371 
               A006346
%Y A117811 Adjacent sequences: A117808 A117809 A117810 this_sequence A117812 A117813 
               A117814
%K A117811 nonn,tabf
%O A117811 1,3
%A A117811 N. J. A. Sloane (njas(AT)research.att.com), Dec 23 2006