n^2 + {1,3,7} are primes.

Terms

a(0) =2a(1) =4a(2) =10a(3) =74a(4) =146a(5) =256a(6) =440a(7) =470a(8) =584a(9) =920a(10) =1070a(11) =1156a(12) =1324a(13) =1394a(14) =1420a(15) =2080a(16) =2470a(17) =2600a(18) =3326a(19) =3746a(20) =4796a(21) =5996a(22) =6460a(23) =7160a(24) =7466a(25) =8894a(26) =9164a(27) =9554a(28) =9596a(29) =10490