Numbers n such that string 7,4 occurs in the base 9 representation of n but not of n+1.

Terms

a(0) =67a(1) =148a(2) =229a(3) =310a(4) =391a(5) =472a(6) =553a(7) =611a(8) =634a(9) =715a(10) =796a(11) =877a(12) =958a(13) =1039a(14) =1120a(15) =1201a(16) =1282a(17) =1340a(18) =1363a(19) =1444a(20) =1525a(21) =1606a(22) =1687a(23) =1768a(24) =1849a(25) =1930a(26) =2011a(27) =2069a(28) =2092a(29) =2173