Q(sqrt n) is a unique factorization domain (or simple quadratic field).

Terms

a(0) =2a(1) =3a(2) =5a(3) =6a(4) =7a(5) =11a(6) =13a(7) =14a(8) =17a(9) =19a(10) =21a(11) =22a(12) =23a(13) =29a(14) =31a(15) =33a(16) =37a(17) =38a(18) =41a(19) =43a(20) =46a(21) =47a(22) =53a(23) =57a(24) =59a(25) =61a(26) =62a(27) =67a(28) =69a(29) =71