Numbers n such that string 4,8 occurs in the base 10 representation of n but not of n-1.

Terms

a(0) =48a(1) =148a(2) =248a(3) =348a(4) =448a(5) =480a(6) =548a(7) =648a(8) =748a(9) =848a(10) =948a(11) =1048a(12) =1148a(13) =1248a(14) =1348a(15) =1448a(16) =1480a(17) =1548a(18) =1648a(19) =1748a(20) =1848a(21) =1948a(22) =2048a(23) =2148a(24) =2248a(25) =2348a(26) =2448a(27) =2480a(28) =2548a(29) =2648