Sum of composite divisors of n that are less than n and are not primes nor prime powers.

Terms

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