Emirps containing only the digits 1 and 2.

Terms

a(0) =111211a(1) =112111a(2) =12122221a(3) =12222121a(4) =1111122121a(5) =1212211111a(6) =11121211121a(7) =11212221121a(8) =12111212111a(9) =12112221211a(10) =111122221121a(11) =111122222111a(12) =111122222221a(13) =111211221221a(14) =111212212211a(15) =111212222111a(16) =111222212111a(17) =111222221111a(18) =112111211221a(19) =112122112211a(20) =112122211121