Composite numbers whose prime factors contain no digits other than 1 and 8.

Terms

a(0) =121a(1) =1331a(2) =1991a(3) =8921a(4) =9691a(5) =12991a(6) =14641a(7) =19921a(8) =21901a(9) =32761a(10) =89221a(11) =98131a(12) =106601a(13) =142901a(14) =146791a(15) =159461a(16) =161051a(17) =199991a(18) =213761a(19) =219131a(20) =240911a(21) =327791a(22) =360371a(23) =657721a(24) =714491a(25) =776161a(26) =892991a(27) =957791a(28) =976921a(29) =981431