Numbers n such that 249*2^n-1 is prime.

Terms

a(0) =8a(1) =9a(2) =12a(3) =41a(4) =57a(5) =156a(6) =201a(7) =249a(8) =612a(9) =956a(10) =1617a(11) =2064a(12) =2091a(13) =2547a(14) =4512a(15) =5696a(16) =9608a(17) =11444a(18) =20556a(19) =33896a(20) =77079a(21) =89004a(22) =251036