Primes of the form 3n^3-1.

Terms

a(0) =2a(1) =23a(2) =191a(3) =647a(4) =2999a(5) =8231a(6) =52727a(7) =117911a(8) =139967a(9) =191999a(10) =255551a(11) =472391a(12) =786431a(13) =862487a(14) =1028999a(15) =1778111a(16) =1908167a(17) =2336063a(18) =2999999a(19) =3183623a(20) =4682687a(21) =5447543a(22) =7218311a(23) =9336407a(24) =10124999a(25) =10535423a(26) =11389247a(27) =12287999a(28) =15265343