a(n) is the smallest number >= 1 not occurring earlier and not the sum of cubes of two distinct earlier terms.
A031980
a(n) is the smallest number >= 1 not occurring earlier and not the sum of cubes of two distinct earlier terms.
Terms
- a(0) =1a(1) =2a(2) =3a(3) =4a(4) =5a(5) =6a(6) =7a(7) =8a(8) =10a(9) =11a(10) =12a(11) =13a(12) =14a(13) =15a(14) =16a(15) =17a(16) =18a(17) =19a(18) =20a(19) =21a(20) =22a(21) =23a(22) =24a(23) =25a(24) =26a(25) =27a(26) =29a(27) =30a(28) =31a(29) =32
External references
- oeis: A031980