Numbers k such that 0 and 6 occur juxtaposed in the base-10 representation of k but not of k-1.

Terms

a(0) =60a(1) =106a(2) =160a(3) =206a(4) =260a(5) =306a(6) =360a(7) =406a(8) =460a(9) =506a(10) =560a(11) =600a(12) =660a(13) =706a(14) =760a(15) =806a(16) =860a(17) =906a(18) =960a(19) =1006a(20) =1060a(21) =1106a(22) =1160a(23) =1206a(24) =1260a(25) =1306a(26) =1360a(27) =1406a(28) =1460a(29) =1506