Numbers k such that string 3,1 occurs in the base 9 representation of k but not of k-1.

Terms

a(0) =28a(1) =109a(2) =190a(3) =252a(4) =271a(5) =352a(6) =433a(7) =514a(8) =595a(9) =676a(10) =757a(11) =838a(12) =919a(13) =981a(14) =1000a(15) =1081a(16) =1162a(17) =1243a(18) =1324a(19) =1405a(20) =1486a(21) =1567a(22) =1648a(23) =1710a(24) =1729a(25) =1810a(26) =1891a(27) =1972a(28) =2053a(29) =2134