Odd numbers with increasing numbers of bases to which they are strong pseudoprimes.

Terms

a(0) =9a(1) =25a(2) =49a(3) =91a(4) =341a(5) =481a(6) =703a(7) =1541a(8) =1891a(9) =2701a(10) =5461a(11) =6533a(12) =8911a(13) =12403a(14) =18721a(15) =29341a(16) =31621a(17) =38503a(18) =79003a(19) =88831a(20) =146611a(21) =188191a(22) =218791a(23) =269011a(24) =286903a(25) =385003a(26) =497503a(27) =597871a(28) =736291a(29) =765703