Numbers n such that 43*2^n-1 is prime.

Terms

a(0) =7a(1) =31a(2) =67a(3) =251a(4) =767a(5) =1171a(6) =1643a(7) =25423a(8) =38863a(9) =50867a(10) =60391a(11) =100303a(12) =286171a(13) =399767