a(n) = n' = arithmetic derivative of n: a(0) = a(1) = 0, a(prime) = 1, a(m*n) = m*a(n) + n*a(m).

Terms

a(0) =0a(1) =0a(2) =1a(3) =1a(4) =4a(5) =1a(6) =5a(7) =1a(8) =12a(9) =6a(10) =7a(11) =1a(12) =16a(13) =1a(14) =9a(15) =8a(16) =32a(17) =1a(18) =21a(19) =1a(20) =24a(21) =10a(22) =13a(23) =1a(24) =44a(25) =10a(26) =15a(27) =27a(28) =32a(29) =1