Differences between two positive cubes in exactly 3 ways.

Terms

a(0) =3367a(1) =26936a(2) =90909a(3) =152551a(4) =205352a(5) =215488a(6) =420875a(7) =622232a(8) =625177a(9) =727272a(10) =754299a(11) =757701a(12) =845208a(13) =1147627a(14) =1154881a(15) =1220408a(16) =1642816a(17) =1723904a(18) =2113921a(19) =2454543a(20) =2741256a(21) =3056473a(22) =3367000a(23) =3442887a(24) =3492125a(25) =4481477a(26) =4977856a(27) =5001416a(28) =5544504a(29) =5818176