Numbers k such that sigma(k^3) is prime.

Terms

a(0) =4a(1) =9a(2) =16a(3) =25a(4) =64a(5) =81a(6) =169a(7) =289a(8) =625a(9) =961a(10) =1024a(11) =2401a(12) =3721a(13) =5329a(14) =7921a(15) =22201a(16) =26569a(17) =63001a(18) =121801a(19) =124609a(20) =212521a(21) =273529a(22) =358801a(23) =418609a(24) =744769a(25) =885481a(26) =896809a(27) =1048576a(28) =1181569a(29) =1247689