Sums of 4 distinct powers of 7.

Terms

a(0) =400a(1) =2458a(2) =2752a(3) =2794a(4) =2800a(5) =16864a(6) =17158a(7) =17200a(8) =17206a(9) =19216a(10) =19258a(11) =19264a(12) =19552a(13) =19558a(14) =19600a(15) =117706a(16) =118000a(17) =118042a(18) =118048a(19) =120058a(20) =120100a(21) =120106a(22) =120394a(23) =120400a(24) =120442a(25) =134464a(26) =134506a(27) =134512a(28) =134800a(29) =134806