Squares that become a prime number when prefixed with a 1.

Terms

a(0) =1a(1) =9a(2) =49a(3) =81a(4) =289a(5) =361a(6) =1369a(7) =1681a(8) =2401a(9) =2601a(10) =2809a(11) =3249a(12) =3721a(13) =4489a(14) =5329a(15) =6561a(16) =6889a(17) =7569a(18) =7921a(19) =9801a(20) =10609a(21) =14161a(22) =14641a(23) =19321a(24) =19881a(25) =21609a(26) =22201a(27) =25921a(28) =32761a(29) =35721