Strong pseudoprimes to bases 2 and 3.

Terms

a(0) =1373653a(1) =1530787a(2) =1987021a(3) =2284453a(4) =3116107a(5) =5173601a(6) =6787327a(7) =11541307a(8) =13694761a(9) =15978007a(10) =16070429a(11) =16879501a(12) =25326001a(13) =27509653a(14) =27664033a(15) =28527049a(16) =54029741a(17) =61832377a(18) =66096253a(19) =74927161a(20) =80375707a(21) =101649241