Numbers n such that string 6,0 occurs in the base 10 representation of n but not of n+1.

Terms

a(0) =60a(1) =160a(2) =260a(3) =360a(4) =460a(5) =560a(6) =609a(7) =660a(8) =760a(9) =860a(10) =960a(11) =1060a(12) =1160a(13) =1260a(14) =1360a(15) =1460a(16) =1560a(17) =1609a(18) =1660a(19) =1760a(20) =1860a(21) =1960a(22) =2060a(23) =2160a(24) =2260a(25) =2360a(26) =2460a(27) =2560a(28) =2609a(29) =2660