Least number k > n such that n concatenated with k produces a cube.

Terms

a(0) =25a(1) =7a(2) =43a(3) =913a(4) =12a(5) =859a(6) =29a(7) =5184a(8) =261a(9) =648a(10) =7649a(11) =167a(12) =31a(13) =8877a(14) =625a(15) =6375a(16) =28a(17) =5193a(18) =683a(19) =5379a(20) =97a(21) =6981a(22) =8328a(23) =389a(24) =15456a(25) =2144a(26) =44a(27) =7496a(28) =791a(29) =48625