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

Terms

a(0) =11a(1) =110a(2) =211a(3) =311a(4) =411a(5) =511a(6) =611a(7) =711a(8) =811a(9) =911a(10) =1011a(11) =1100a(12) =1211a(13) =1311a(14) =1411a(15) =1511a(16) =1611a(17) =1711a(18) =1811a(19) =1911a(20) =2011a(21) =2110a(22) =2211a(23) =2311a(24) =2411a(25) =2511a(26) =2611a(27) =2711a(28) =2811a(29) =2911