Strong pseudoprimes to base 31.

Terms

a(0) =15a(1) =49a(2) =133a(3) =481a(4) =931a(5) =6241a(6) =8911a(7) =9131a(8) =10963a(9) =11041a(10) =14191a(11) =17767a(12) =29341a(13) =56033a(14) =58969a(15) =68251a(16) =79003a(17) =83333a(18) =87061a(19) =88183a(20) =113527a(21) =130561a(22) =131407a(23) =164737a(24) =190861a(25) =197209a(26) =206981a(27) =210337a(28) =229633a(29) =244949