Primes where every other digit is 3 starting with the rightmost digit, and no other digit is 3.

Terms

a(0) =3a(1) =13a(2) =23a(3) =43a(4) =53a(5) =73a(6) =83a(7) =313a(8) =353a(9) =373a(10) =383a(11) =1303a(12) =1373a(13) =2383a(14) =2393a(15) =4363a(16) =4373a(17) =5303a(18) =5323a(19) =5393a(20) =6323a(21) =6343a(22) =6353a(23) =6373a(24) =7393a(25) =8353a(26) =8363a(27) =9323a(28) =9343a(29) =30313