Numbers that look the same when rotated by 180 degrees, using only digits 0, 6 and 9.

Terms

a(0) =0a(1) =69a(2) =96a(3) =609a(4) =906a(5) =6009a(6) =6699a(7) =6969a(8) =9006a(9) =9696a(10) =9966a(11) =60009a(12) =66099a(13) =69069a(14) =90006a(15) =96096a(16) =99066a(17) =600009a(18) =606909a(19) =609609a(20) =660099a(21) =666999a(22) =669699a(23) =690069a(24) =696969a(25) =699669a(26) =900006a(27) =906906a(28) =909606a(29) =960096