a(n) is the least number not of the form floor(k^2/n).

Terms

a(0) =2a(1) =1a(2) =2a(3) =3a(4) =2a(5) =3a(6) =4a(7) =5a(8) =3a(9) =5a(10) =6a(11) =7a(12) =5a(13) =6a(14) =7a(15) =8a(16) =6a(17) =7a(18) =9a(19) =10a(20) =7a(21) =9a(22) =10a(23) =11a(24) =8a(25) =10a(26) =11a(27) =13a(28) =10a(29) =11