Strong pseudoprimes to base 55.

Terms

a(0) =9a(1) =27a(2) =1027a(3) =1387a(4) =1513a(5) =4033a(6) =6533a(7) =9773a(8) =10649a(9) =19513a(10) =20491a(11) =20797a(12) =27613a(13) =28009a(14) =28939a(15) =29891a(16) =31021a(17) =38503a(18) =43877a(19) =55981a(20) =56033a(21) =74971a(22) =80137a(23) =82513a(24) =83333a(25) =91001a(26) =92101a(27) =112471a(28) =113491a(29) =117569