Squares k such that k - 2 and k + 2 are prime.

Terms

a(0) =9a(1) =81a(2) =225a(3) =441a(4) =1089a(5) =13689a(6) =56169a(7) =74529a(8) =91809a(9) =95481a(10) =149769a(11) =184041a(12) =194481a(13) =199809a(14) =263169a(15) =314721a(16) =328329a(17) =370881a(18) =651249a(19) =804609a(20) =1071225a(21) =1147041a(22) =1238769a(23) =1306449a(24) =1520289a(25) =1535121a(26) =1718721a(27) =2442969a(28) =2595321a(29) =2614689