Primes having only {1, 2, 3} as digits.

Terms

a(0) =2a(1) =3a(2) =11a(3) =13a(4) =23a(5) =31a(6) =113a(7) =131a(8) =211a(9) =223a(10) =233a(11) =311a(12) =313a(13) =331a(14) =1123a(15) =1213a(16) =1223a(17) =1231a(18) =1321a(19) =2111a(20) =2113a(21) =2131a(22) =2213a(23) =2221a(24) =2311a(25) =2333a(26) =3121a(27) =3221a(28) =3313a(29) =3323