Cubes c such that c + 2 and c - 2 are semiprime.

Terms

a(0) =8a(1) =216a(2) =1331a(3) =2197a(4) =4913a(5) =9261a(6) =15625a(7) =35937a(8) =59319a(9) =68921a(10) =117649a(11) =185193a(12) =421875a(13) =531441a(14) =658503a(15) =704969a(16) =1030301a(17) =1367631a(18) =3723875a(19) =5268024a(20) =5359375a(21) =11390625a(22) =13651919a(23) =16581375a(24) =17779581a(25) =19902511a(26) =23149125a(27) =25672375a(28) =29503629a(29) =36264691