Primes made up of only 3's and a 4 and at most two 2's.

Terms

a(0) =23a(1) =43a(2) =223a(3) =233a(4) =433a(5) =2333a(6) =3323a(7) =3343a(8) =3433a(9) =23333a(10) =32233a(11) =32323a(12) =33223a(13) =33343a(14) =232333a(15) =233323a(16) =323233a(17) =323333a(18) =333233a(19) =333323a(20) =333433a(21) =334333a(22) =343333a(23) =2332333a(24) =2333323a(25) =3223333a(26) =3233323a(27) =3233333a(28) =3332233a(29) =3333233