Sums of three Fermat numbers.

Terms

a(0) =9a(1) =11a(2) =13a(3) =15a(4) =23a(5) =25a(6) =27a(7) =37a(8) =39a(9) =51a(10) =263a(11) =265a(12) =267a(13) =277a(14) =279a(15) =291a(16) =517a(17) =519a(18) =531a(19) =771a(20) =65543a(21) =65545a(22) =65547a(23) =65557a(24) =65559a(25) =65571a(26) =65797a(27) =65799a(28) =65811a(29) =66051