4n^2+1, 2n^2+1, 2n^2-1 are all prime.

Terms

a(0) =3a(1) =42a(2) =45a(3) =102a(4) =132a(5) =153a(6) =237a(7) =297a(8) =375a(9) =468a(10) =570a(11) =990a(12) =2085a(13) =2478a(14) =2712a(15) =3240a(16) =4743a(17) =5382a(18) =5517a(19) =6828a(20) =7962a(21) =8970a(22) =8982a(23) =9033a(24) =9570a(25) =9612a(26) =9747a(27) =9813a(28) =10692a(29) =12363