Duplicate of A030729.

Terms

a(0) =1a(1) =2a(2) =3a(3) =3a(4) =5a(5) =7a(6) =9a(7) =11a(8) =13a(9) =15a(10) =17a(11) =19a(12) =20a(13) =22a(14) =24a(15) =27a(16) =30a(17) =35a(18) =38a(19) =41a(20) =44a(21) =46a(22) =49a(23) =52a(24) =58a(25) =61a(26) =63a(27) =67