Pseudoprimes to base 21.

Terms

a(0) =4a(1) =10a(2) =20a(3) =55a(4) =65a(5) =85a(6) =221a(7) =703a(8) =793a(9) =1045a(10) =1105a(11) =1852a(12) =2035a(13) =2465a(14) =3781a(15) =4630a(16) =5185a(17) =5473a(18) =5995a(19) =6541a(20) =7363a(21) =8695a(22) =8965a(23) =9061a(24) =10585a(25) =10945a(26) =11647a(27) =13019a(28) =13051a(29) =13981