Numbers n such that 131*2^n-1 is prime.

Terms

a(0) =2a(1) =14a(2) =34a(3) =38a(4) =42a(5) =78a(6) =90a(7) =178a(8) =778a(9) =974a(10) =1878a(11) =3718a(12) =4050a(13) =5466a(14) =6478a(15) =35662a(16) =40046a(17) =56346a(18) =98626a(19) =131026a(20) =138658