Haiku numbers.

Terms

a(0) =77777a(1) =101777a(2) =102777a(3) =103777a(4) =104777a(5) =105777a(6) =106777a(7) =107177a(8) =107277a(9) =107377a(10) =107477a(11) =107577a(12) =107677a(13) =107727a(14) =107737a(15) =107747a(16) =107757a(17) =107767a(18) =107771a(19) =107772a(20) =107773a(21) =107774a(22) =107775a(23) =107776a(24) =107778a(25) =107779a(26) =107787a(27) =107797a(28) =107877a(29) =107977