Primes written in base 4.

Terms

a(0) =2a(1) =3a(2) =11a(3) =13a(4) =23a(5) =31a(6) =101a(7) =103a(8) =113a(9) =131a(10) =133a(11) =211a(12) =221a(13) =223a(14) =233a(15) =311a(16) =323a(17) =331a(18) =1003a(19) =1013a(20) =1021a(21) =1033a(22) =1103a(23) =1121a(24) =1201a(25) =1211a(26) =1213a(27) =1223a(28) =1231a(29) =1301