Sum of cubes of proper divisors of n.

Terms

a(0) =0a(1) =1a(2) =1a(3) =9a(4) =1a(5) =36a(6) =1a(7) =73a(8) =28a(9) =134a(10) =1a(11) =316a(12) =1a(13) =352a(14) =153a(15) =585a(16) =1a(17) =981a(18) =1a(19) =1198a(20) =371a(21) =1340a(22) =1a(23) =2556a(24) =126a(25) =2206a(26) =757a(27) =3160a(28) =1a(29) =4752