Ulam numbers: a(1) = 1; a(2) = 2; for n>2, a(n) = least number > a(n-1) which is a unique sum of two distinct earlier terms.
A002858
Ulam numbers: a(1) = 1; a(2) = 2; for n>2, a(n) = least number > a(n-1) which is a unique sum of two distinct earlier terms.
Terms
- a(0) =1a(1) =2a(2) =3a(3) =4a(4) =6a(5) =8a(6) =11a(7) =13a(8) =16a(9) =18a(10) =26a(11) =28a(12) =36a(13) =38a(14) =47a(15) =48a(16) =53a(17) =57a(18) =62a(19) =69a(20) =72a(21) =77a(22) =82a(23) =87a(24) =97a(25) =99a(26) =102a(27) =106a(28) =114a(29) =126
External references
- oeis: A002858