Even legs of Pythagorean triangles whose other leg and hypotenuse are both prime.

Terms

a(0) =4a(1) =12a(2) =60a(3) =180a(4) =420a(5) =1740a(6) =1860a(7) =2520a(8) =3120a(9) =5100a(10) =8580a(11) =9660a(12) =16380a(13) =19800a(14) =36720a(15) =60900a(16) =71820a(17) =83640a(18) =100800a(19) =106260a(20) =135720a(21) =161880a(22) =163020a(23) =199080a(24) =205440a(25) =218460a(26) =273060a(27) =282000a(28) =337020a(29) =388080