Digit '8' concatenated with a(n) is a lucky number.

Terms

a(0) =7a(1) =19a(2) =23a(3) =31a(4) =41a(5) =55a(6) =67a(7) =73a(8) =83a(9) =85a(10) =95a(11) =97a(12) =107a(13) =109a(14) =127a(15) =131a(16) =139a(17) =151a(18) =161a(19) =169a(20) =173a(21) =175a(22) =191a(23) =193a(24) =221a(25) =223a(26) =227a(27) =233a(28) =253a(29) =257