Numbers k such that 0 and 5 occur juxtaposed in the base-10 representation of k but not of k+1.

Terms

a(0) =50a(1) =105a(2) =150a(3) =205a(4) =250a(5) =305a(6) =350a(7) =405a(8) =450a(9) =509a(10) =550a(11) =605a(12) =650a(13) =705a(14) =750a(15) =805a(16) =850a(17) =905a(18) =950a(19) =1005a(20) =1059a(21) =1105a(22) =1150a(23) =1205a(24) =1250a(25) =1305a(26) =1350a(27) =1405a(28) =1450a(29) =1509