If n = Product (p_j^k_j), a(n) = numerator of Sum 1/p_j (the denominator of this sum is A007947).

Terms

a(0) =0a(1) =1a(2) =1a(3) =1a(4) =1a(5) =5a(6) =1a(7) =1a(8) =1a(9) =7a(10) =1a(11) =5a(12) =1a(13) =9a(14) =8a(15) =1a(16) =1a(17) =5a(18) =1a(19) =7a(20) =10a(21) =13a(22) =1a(23) =5a(24) =1a(25) =15a(26) =1a(27) =9a(28) =1a(29) =31