Numbers n such that 81*2^n-1 is prime.

Terms

a(0) =3a(1) =5a(2) =11a(3) =17a(4) =21a(5) =27a(6) =81a(7) =101a(8) =107a(9) =327a(10) =383a(11) =387a(12) =941a(13) =1665a(14) =3515a(15) =4007a(16) =4727a(17) =7137a(18) =16257a(19) =16833a(20) =21243a(21) =24239a(22) =35435a(23) =59925a(24) =91673a(25) =153455a(26) =165341a(27) =183167a(28) =190349a(29) =240743