Least multiple of 2n-1 ending in prime(n), 0 if no such number exists.

Terms

a(0) =2a(1) =3a(2) =5a(3) =7a(4) =711a(5) =913a(6) =117a(7) =0a(8) =323a(9) =1729a(10) =231a(11) =437a(12) =0a(13) =243a(14) =1247a(15) =1953a(16) =759a(17) =0a(18) =3367a(19) =3471a(20) =2173a(21) =2279a(22) =0a(23) =4089a(24) =2597a(25) =28101a(26) =45103a(27) =0a(28) =2109a(29) =18113