Squares that become a prime number when prefixed with a 5.

Terms

a(0) =9a(1) =441a(2) =1521a(3) =12321a(4) =19881a(5) =29241a(6) =59049a(7) =74529a(8) =95481a(9) =123201a(10) =168921a(11) =199809a(12) =227529a(13) =263169a(14) =288369a(15) =328329a(16) =356409a(17) =370881a(18) =385641a(19) =471969a(20) =480249a(21) =488601a(22) =531441a(23) =558009a(24) =594441a(25) =603729a(26) =613089a(27) =622521a(28) =690561a(29) =741321