Numbers whose base-7 representation contains exactly four 1's.

Terms

a(0) =400a(1) =2458a(2) =2752a(3) =2794a(4) =2800a(5) =2802a(6) =2803a(7) =2804a(8) =2805a(9) =2806a(10) =2808a(11) =2815a(12) =2822a(13) =2829a(14) =2836a(15) =2850a(16) =2899a(17) =2948a(18) =2997a(19) =3046a(20) =3144a(21) =3487a(22) =3830a(23) =4173a(24) =4516a(25) =5202a(26) =7603a(27) =10004a(28) =12405a(29) =14806