Number of distinct products ij with 1 <= i <= n, 1 <= j <= n, (i,j)=1.

Terms

a(0) =1a(1) =2a(2) =4a(3) =6a(4) =10a(5) =11a(6) =17a(7) =21a(8) =27a(9) =29a(10) =39a(11) =42a(12) =54a(13) =57a(14) =62a(15) =70a(16) =86a(17) =89a(18) =107a(19) =113a(20) =120a(21) =125a(22) =147a(23) =152a(24) =172a(25) =178a(26) =196a(27) =204a(28) =232a(29) =236