Strong pseudoprimes to base 53.

Terms

a(0) =9a(1) =27a(2) =91a(3) =1405a(4) =1441a(5) =1541a(6) =2209a(7) =2863a(8) =3367a(9) =3481a(10) =5317a(11) =6031a(12) =9409a(13) =11359a(14) =14833a(15) =17141a(16) =17461a(17) =27937a(18) =31753a(19) =37219a(20) =50041a(21) =61391a(22) =62341a(23) =68251a(24) =80041a(25) =94657a(26) =96049a(27) =105931a(28) =123391a(29) =131131