Numbers k such that 2*9^k + 1 is prime.

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =8a(5) =15a(6) =27a(7) =30a(8) =66a(9) =90a(10) =160a(11) =348a(12) =391a(13) =411a(14) =626a(15) =727a(16) =2740a(17) =3921a(18) =6048a(19) =6891a(20) =8860a(21) =21978a(22) =32411a(23) =41390a(24) =52553a(25) =82948a(26) =95907a(27) =264840a(28) =537363a(29) =543056