Bertrand primes II: a(n) is the largest prime < 2*a(n-1)-2.

Terms

a(0) =5a(1) =7a(2) =11a(3) =19a(4) =31a(5) =59a(6) =113a(7) =223a(8) =443a(9) =883a(10) =1759a(11) =3511a(12) =7019a(13) =14033a(14) =28057a(15) =56101a(16) =112199a(17) =224363a(18) =448703a(19) =897401a(20) =1794787a(21) =3589571a(22) =7179127a(23) =14358247a(24) =28716487a(25) =57432961a(26) =114865903a(27) =229731787a(28) =459463553a(29) =918927083