Primes where every other digit is 9 starting with the rightmost digit, and no other digit is 9.

Terms

a(0) =19a(1) =29a(2) =59a(3) =79a(4) =89a(5) =919a(6) =929a(7) =1949a(8) =1979a(9) =2909a(10) =2939a(11) =2969a(12) =3919a(13) =3929a(14) =3989a(15) =4909a(16) =4919a(17) =4969a(18) =5939a(19) =6949a(20) =6959a(21) =7919a(22) =7949a(23) =8929a(24) =8969a(25) =90989a(26) =91909a(27) =91939a(28) =91969a(29) =92959