Numbers n such that 121*2^n-1 is a prime.

Terms

a(0) =1a(1) =3a(2) =21a(3) =27a(4) =37a(5) =43a(6) =91a(7) =117a(8) =141a(9) =163a(10) =373a(11) =421a(12) =1581a(13) =2035a(14) =10701a(15) =18931a(16) =21307a(17) =51195a(18) =64579a(19) =156541a(20) =302097a(21) =334257a(22) =368059a(23) =383061a(24) =410131a(25) =494317a(26) =541621a(27) =990219a(28) =1039965a(29) =1526097