Smallest prime p such that p - 3^n + 1 is also a prime.

Terms

a(0) =2a(1) =5a(2) =11a(3) =29a(4) =83a(5) =271a(6) =733a(7) =2203a(8) =6563a(9) =19687a(10) =59051a(11) =177217a(12) =531457a(13) =1594339a(14) =4782971a(15) =14348909a(16) =43046749a(17) =129140251a(18) =387420499a(19) =1162261603a(20) =3486784447a(21) =10460353369a(22) =31381059613a(23) =94143178933a(24) =282429536483a(25) =847288609471