Numbers k such that string 4,7 occurs in the base 8 representation of k but not of k-1.

Terms

a(0) =39a(1) =103a(2) =167a(3) =231a(4) =295a(5) =312a(6) =359a(7) =423a(8) =487a(9) =551a(10) =615a(11) =679a(12) =743a(13) =807a(14) =824a(15) =871a(16) =935a(17) =999a(18) =1063a(19) =1127a(20) =1191a(21) =1255a(22) =1319a(23) =1336a(24) =1383a(25) =1447a(26) =1511a(27) =1575a(28) =1639a(29) =1703