Smallest number with "natural" logarithm n, cf. A061373.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =5a(5) =7a(6) =10a(7) =11a(8) =17a(9) =22a(10) =23a(11) =41a(12) =46a(13) =47a(14) =83a(15) =94a(16) =139a(17) =167a(18) =235a(19) =283a(20) =359a(21) =517a(22) =659a(23) =719a(24) =1081a(25) =1319a(26) =1439a(27) =2209a(28) =2878a(29) =2879