Primes of form x^2+21*y^2.

Terms

a(0) =37a(1) =109a(2) =193a(3) =277a(4) =337a(5) =373a(6) =421a(7) =457a(8) =541a(9) =613a(10) =673a(11) =709a(12) =757a(13) =877a(14) =1009a(15) =1033a(16) =1093a(17) =1117a(18) =1129a(19) =1201a(20) =1213a(21) =1297a(22) =1381a(23) =1429a(24) =1453a(25) =1549a(26) =1597a(27) =1621a(28) =1789a(29) =1801