1,3

Table begins:

1 1

2 1

3 1

1 2 (so 4 = 1*2^2)

5 1

6 1

7 1

2 2 (so 8 = 2*2^2)

1 3

10 1

11 1

3 2

13 1

14 1

15 1

1 4

(MAGMA) at:=0; for n in [1..100] do print Squarefree(n); end for;

The two columns are A007913, A000188.

Sequence in context: A070099 A126760 A007740 this_sequence A051793 A065371 A006346

Adjacent sequences: A117808 A117809 A117810 this_sequence A117812 A117813 A117814

nonn,tabf

N. J. A. Sloane (njas(AT)research.att.com), Dec 23 2006