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

Terms

a(0) =2a(1) =3a(2) =23a(3) =43a(4) =223a(5) =233a(6) =433a(7) =443a(8) =2243a(9) =2333a(10) =2423a(11) =3323a(12) =3343a(13) =3433a(14) =4243a(15) =4423a(16) =22343a(17) =22433a(18) =23333a(19) =24223a(20) =24443a(21) =32233a(22) =32323a(23) =32423a(24) =32443a(25) =33223a(26) =33343a(27) =42223a(28) =42323a(29) =42433