Numbers n such that string 7,1 occurs in the base 8 representation of n but not of n-1.

Terms

a(0) =57a(1) =121a(2) =185a(3) =249a(4) =313a(5) =377a(6) =441a(7) =456a(8) =505a(9) =569a(10) =633a(11) =697a(12) =761a(13) =825a(14) =889a(15) =953a(16) =968a(17) =1017a(18) =1081a(19) =1145a(20) =1209a(21) =1273a(22) =1337a(23) =1401a(24) =1465a(25) =1480a(26) =1529a(27) =1593a(28) =1657a(29) =1721