Non-coprime pseudoprimes to base 3 (A306451) that are not squarefree.

Terms

a(0) =726a(1) =1053426a(2) =6498426a(3) =7912311a(4) =8141001a(5) =190381521a(6) =202730781a(7) =283975626a(8) =524245326a(9) =767159481a(10) =1095790641a(11) =1620456321a(12) =1904467521a(13) =2287621281a(14) =2700546486a(15) =3462782961a(16) =4120800321a(17) =4928482581a(18) =5816852481a(19) =5974336401a(20) =9313587921a(21) =18723332001a(22) =21215225361a(23) =22073079666a(24) =29882080866a(25) =30132305841