Primes whose consecutive digits differ by 8 or 9.

Terms

a(0) =2a(1) =3a(2) =5a(3) =7a(4) =19a(5) =191a(6) =809a(7) =919a(8) =9091a(9) =80809a(10) =80909a(11) =91909a(12) =190909a(13) =909091a(14) =1908091a(15) =1909091a(16) =9090919a(17) =9091909a(18) =19090909a(19) =80919191a(20) =190909091a(21) =191908091a(22) =809080919a(23) =809191919a(24) =908080909a(25) =919080919a(26) =919191919a(27) =1909080809