Numbers n such that string 3,4 occurs in the base 10 representation of n but not of n+1.

Terms

a(0) =34a(1) =134a(2) =234a(3) =334a(4) =349a(5) =434a(6) =534a(7) =634a(8) =734a(9) =834a(10) =934a(11) =1034a(12) =1134a(13) =1234a(14) =1334a(15) =1349a(16) =1434a(17) =1534a(18) =1634a(19) =1734a(20) =1834a(21) =1934a(22) =2034a(23) =2134a(24) =2234a(25) =2334a(26) =2349a(27) =2434a(28) =2534a(29) =2634