Numbers n such that string 5,4 occurs in the base 10 representation of n but not of n-1.

Terms

a(0) =54a(1) =154a(2) =254a(3) =354a(4) =454a(5) =540a(6) =554a(7) =654a(8) =754a(9) =854a(10) =954a(11) =1054a(12) =1154a(13) =1254a(14) =1354a(15) =1454a(16) =1540a(17) =1554a(18) =1654a(19) =1754a(20) =1854a(21) =1954a(22) =2054a(23) =2154a(24) =2254a(25) =2354a(26) =2454a(27) =2540a(28) =2554a(29) =2654