If n = Product p(k)^e(k) then a(n) = Product (p(k)-1)^e(k).

Terms

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