Primes that become squares when prefixed with a 2.

Terms

a(0) =5a(1) =89a(2) =401a(3) =601a(4) =809a(5) =1609a(6) =2801a(7) =4649a(8) =5281a(9) =6569a(10) =9241a(11) =9929a(12) =14369a(13) =18089a(14) =19961a(15) =21841a(16) =27529a(17) =33289a(18) =41081a(19) =43049a(20) =51001a(21) =61121a(22) =67289a(23) =73529a(24) =79841a(25) =84089a(26) =92681a(27) =94849