Primes having only {2, 3, 4, 6} as digits.

Terms

a(0) =2a(1) =3a(2) =23a(3) =43a(4) =223a(5) =233a(6) =263a(7) =433a(8) =443a(9) =463a(10) =643a(11) =2243a(12) =2333a(13) =2423a(14) =2633a(15) =2663a(16) =3323a(17) =3343a(18) =3433a(19) =3463a(20) =3623a(21) =3643a(22) =4243a(23) =4363a(24) =4423a(25) =4463a(26) =4643a(27) =4663a(28) =6263a(29) =6323