a(1)=2, a(2)=3; for n >= 3, a(n) is smallest number that is uniquely of the form a(j) + a(k) with 1 <= j < k < n.
A001857
a(1)=2, a(2)=3; for n >= 3, a(n) is smallest number that is uniquely of the form a(j) + a(k) with 1 <= j < k < n.
Terms
- a(0) =2a(1) =3a(2) =5a(3) =7a(4) =8a(5) =9a(6) =13a(7) =14a(8) =18a(9) =19a(10) =24a(11) =25a(12) =29a(13) =30a(14) =35a(15) =36a(16) =40a(17) =41a(18) =46a(19) =51a(20) =56a(21) =63a(22) =68a(23) =72a(24) =73a(25) =78a(26) =79a(27) =83a(28) =84a(29) =89
External references
- oeis: A001857