Numbers k such that in the ring Z[sqrt(3)] the norm of (-1+sqrt(3))^k-1 is prime.

Terms

a(0) =2a(1) =3a(2) =7a(3) =13a(4) =19a(5) =43a(6) =61a(7) =151a(8) =257a(9) =751a(10) =859a(11) =1453a(12) =3767a(13) =3889a(14) =8171a(15) =15959a(16) =21499a(17) =22679a(18) =23297a(19) =31277a(20) =43609a(21) =57037a(22) =61961a(23) =103087a(24) =115931a(25) =173647a(26) =215959a(27) =496073