Partial sums of the second power of arithmetic derivative function A003415.

Terms

a(0) =0a(1) =1a(2) =2a(3) =18a(4) =19a(5) =44a(6) =45a(7) =189a(8) =225a(9) =274a(10) =275a(11) =531a(12) =532a(13) =613a(14) =677a(15) =1701a(16) =1702a(17) =2143a(18) =2144a(19) =2720a(20) =2820a(21) =2989a(22) =2990a(23) =4926a(24) =5026a(25) =5251a(26) =5980a(27) =7004a(28) =7005a(29) =7966