Good's example of a "Standard List" of prime words over the alphabet {1,2}.

Terms

a(0) =1a(1) =2a(2) =12a(3) =112a(4) =212a(5) =1112a(6) =2212a(7) =2112a(8) =11112a(9) =21112a(10) =12112a(11) =22112a(12) =12212a(13) =22212a(14) =111112a(15) =211112a(16) =121112a(17) =221112a(18) =122112a(19) =222112a(20) =112212a(21) =122212a(22) =222212a(23) =1111112a(24) =2111112a(25) =1211112a(26) =2211112a(27) =1121112