Prime numbers of the form 3^k +- 2 for k >= 1.

Terms

a(0) =5a(1) =7a(2) =11a(3) =29a(4) =79a(5) =83a(6) =241a(7) =727a(8) =6563a(9) =19681a(10) =59051a(11) =4782971a(12) =14348909a(13) =31381059607a(14) =282429536483