Pseudoprimes to base 20.

Terms

a(0) =21a(1) =57a(2) =133a(3) =231a(4) =399a(5) =561a(6) =671a(7) =861a(8) =889a(9) =1281a(10) =1653a(11) =1729a(12) =1891a(13) =2059a(14) =2413a(15) =2501a(16) =2761a(17) =2821a(18) =2947a(19) =3059a(20) =3201a(21) =4047a(22) =5271a(23) =5461a(24) =5473a(25) =5713a(26) =5833a(27) =6601a(28) =6817a(29) =7999