Primes that become squares when prefixed with a 3.

Terms

a(0) =61a(1) =4969a(2) =6481a(3) =9601a(4) =23761a(5) =26041a(6) =37561a(7) =68449a(8) =88129a(9) =129361a(10) =179089a(11) =214849a(12) =265249a(13) =301489a(14) =308761a(15) =411409a(16) =455881a(17) =463321a(18) =485689a(19) =508129a(20) =523129a(21) =530641a(22) =659569a(23) =713329a(24) =751969a(25) =829849a(26) =916441a(27) =924361a(28) =948169a(29) =964081