Numbers n such that 261*2^n-1 is prime.

Terms

a(0) =1a(1) =3a(2) =6a(3) =9a(4) =21a(5) =34a(6) =43a(7) =49a(8) =114a(9) =115a(10) =178a(11) =322a(12) =411a(13) =438a(14) =454a(15) =589a(16) =598a(17) =754a(18) =801a(19) =1173a(20) =1546a(21) =1699a(22) =2155a(23) =2994a(24) =4038a(25) =5439a(26) =6442a(27) =10699a(28) =12274a(29) =13314