Numbers n such that 55*2^n-1 is prime.

Terms

a(0) =1a(1) =3a(2) =5a(3) =7a(4) =15a(5) =33a(6) =41a(7) =57a(8) =69a(9) =75a(10) =77a(11) =131a(12) =133a(13) =153a(14) =247a(15) =305a(16) =351a(17) =409a(18) =471a(19) =1251a(20) =1259a(21) =2253a(22) =2411a(23) =2425a(24) =2699a(25) =3221a(26) =4099a(27) =4173a(28) =4291a(29) =4905