Strong pseudoprimes to base 28.

Terms

a(0) =9a(1) =27a(2) =361a(3) =529a(4) =785a(5) =1431a(6) =2041a(7) =4699a(8) =5149a(9) =8401a(10) =14981a(11) =17767a(12) =27133a(13) =28009a(14) =32551a(15) =33227a(16) =35443a(17) =38503a(18) =43213a(19) =68143a(20) =80137a(21) =81317a(22) =82513a(23) =96139a(24) =97567a(25) =97831a(26) =113521a(27) =123391a(28) =124501a(29) =133141