Variation on Ulam numbers: a(1) = 1; a(2) = 2; for n>2, a(n) = smallest (n odd) or largest (n even) number > a(n-1) that is a unique sum of two distinct earlier terms.
A081026
Variation on Ulam numbers: a(1) = 1; a(2) = 2; for n>2, a(n) = smallest (n odd) or largest (n even) number > a(n-1) that is a unique sum of two distinct earlier terms.
Terms
- a(0) =1a(1) =2a(2) =3a(3) =5a(4) =6a(5) =11a(6) =12a(7) =23a(8) =24a(9) =47a(10) =48a(11) =95a(12) =96a(13) =191a(14) =192a(15) =383a(16) =384a(17) =767a(18) =768a(19) =1535a(20) =1536a(21) =3071a(22) =3072a(23) =6143a(24) =6144a(25) =12287a(26) =12288a(27) =24575a(28) =24576a(29) =49151
External references
- oeis: A081026