Numbers n such that string 5,0 occurs in the base 10 representation of n but not of n-1.

Terms

a(0) =50a(1) =150a(2) =250a(3) =350a(4) =450a(5) =500a(6) =550a(7) =650a(8) =750a(9) =850a(10) =950a(11) =1050a(12) =1150a(13) =1250a(14) =1350a(15) =1450a(16) =1500a(17) =1550a(18) =1650a(19) =1750a(20) =1850a(21) =1950a(22) =2050a(23) =2150a(24) =2250a(25) =2350a(26) =2450a(27) =2500a(28) =2550a(29) =2650