Smallest prime p > 2^n such that none of p -+ 2^0, p -+ 2^1, p -+ 2^2, ..., p -+ 2^n are prime.

Terms

a(0) =5a(1) =23a(2) =53a(3) =211a(4) =251a(5) =787a(6) =787a(7) =1409a(8) =1777a(9) =1777a(10) =1973a(11) =3181a(12) =4889a(13) =8363a(14) =19583a(15) =34171a(16) =66683a(17) =131701a(18) =263227a(19) =527099a(20) =1049011a(21) =2098027a(22) =4196407a(23) =8389001a(24) =16779001a(25) =33555517a(26) =67108913a(27) =134219273a(28) =268435537a(29) =536871743