Numbers of the form 4^j + 7^k, for j and k >= 0.

Terms

a(0) =2a(1) =5a(2) =8a(3) =11a(4) =17a(5) =23a(6) =50a(7) =53a(8) =65a(9) =71a(10) =113a(11) =257a(12) =263a(13) =305a(14) =344a(15) =347a(16) =359a(17) =407a(18) =599a(19) =1025a(20) =1031a(21) =1073a(22) =1367a(23) =2402a(24) =2405a(25) =2417a(26) =2465a(27) =2657a(28) =3425a(29) =4097