Squares s such that s + 2 and s - 2 are semiprime.

Terms

a(0) =36a(1) =121a(2) =144a(3) =289a(4) =1764a(5) =2304a(6) =2601a(7) =2809a(8) =4225a(9) =5184a(10) =5329a(11) =6241a(12) =6889a(13) =7056a(14) =8100a(15) =9409a(16) =13225a(17) =15625a(18) =17689a(19) =19881a(20) =23409a(21) =25281a(22) =27225a(23) =30276a(24) =34969a(25) =35721a(26) =38025a(27) =40401a(28) =41616a(29) =42849