Least non-sum of divisors of n for some n >= 1.

Terms

a(0) =2a(1) =4a(2) =8a(3) =13a(4) =16a(5) =29a(6) =32a(7) =40a(8) =43a(9) =57a(10) =61a(11) =64a(12) =73a(13) =91a(14) =92a(15) =97a(16) =121a(17) =125a(18) =128a(19) =145a(20) =169a(21) =181a(22) =187a(23) =196a(24) =211a(25) =218a(26) =225a(27) =235a(28) =249a(29) =253