Numbers of the form 4^j + 5^k, for j and k >= 0.

Terms

a(0) =2a(1) =5a(2) =6a(3) =9a(4) =17a(5) =21a(6) =26a(7) =29a(8) =41a(9) =65a(10) =69a(11) =89a(12) =126a(13) =129a(14) =141a(15) =189a(16) =257a(17) =261a(18) =281a(19) =381a(20) =626a(21) =629a(22) =641a(23) =689a(24) =881a(25) =1025a(26) =1029a(27) =1049a(28) =1149a(29) =1649