Sums of 4 distinct powers of 9.

Terms

a(0) =820a(1) =6652a(2) =7300a(3) =7372a(4) =7380a(5) =59140a(6) =59788a(7) =59860a(8) =59868a(9) =65620a(10) =65692a(11) =65700a(12) =66340a(13) =66348a(14) =66420a(15) =531532a(16) =532180a(17) =532252a(18) =532260a(19) =538012a(20) =538084a(21) =538092a(22) =538732a(23) =538740a(24) =538812a(25) =590500a(26) =590572a(27) =590580a(28) =591220a(29) =591228