Pseudoprimes to base 81.

Terms

a(0) =4a(1) =8a(2) =10a(3) =16a(4) =20a(5) =28a(6) =40a(7) =52a(8) =70a(9) =80a(10) =85a(11) =91a(12) =112a(13) =121a(14) =130a(15) =176a(16) =190a(17) =205a(18) =208a(19) =232a(20) =280a(21) =286a(22) =292a(23) =364a(24) =370a(25) =451a(26) =496a(27) =511a(28) =520a(29) =532