Pseudoprimes to base 55.

Terms

a(0) =6a(1) =9a(2) =18a(3) =21a(4) =27a(5) =54a(6) =63a(7) =91a(8) =153a(9) =189a(10) =357a(11) =369a(12) =553a(13) =697a(14) =801a(15) =1027a(16) =1266a(17) =1387a(18) =1513a(19) =1729a(20) =1869a(21) =2701a(22) =2821a(23) =3213a(24) =3649a(25) =4033a(26) =4431a(27) =6273a(28) =6533a(29) =6541