Square numbers of the form prime(k) + 2*prime(k+1).

Terms

a(0) =81a(1) =1521a(2) =9801a(3) =11881a(4) =12321a(5) =20449a(6) =25281a(7) =29241a(8) =32041a(9) =35721a(10) =40401a(11) =53361a(12) =83521a(13) =126025a(14) =168921a(15) =210681a(16) =237169a(17) =245025a(18) =267289a(19) =273529a(20) =290521a(21) =297025a(22) =330625a(23) =370881a(24) =378225a(25) =408321a(26) =423801a(27) =585225a(28) =619369a(29) =635209