Sums of distinct powers of 7.

Terms

a(0) =0a(1) =1a(2) =7a(3) =8a(4) =49a(5) =50a(6) =56a(7) =57a(8) =343a(9) =344a(10) =350a(11) =351a(12) =392a(13) =393a(14) =399a(15) =400a(16) =2401a(17) =2402a(18) =2408a(19) =2409a(20) =2450a(21) =2451a(22) =2457a(23) =2458a(24) =2744a(25) =2745a(26) =2751a(27) =2752a(28) =2793a(29) =2794