Numbers n such that string 2,3 occurs in the base 10 representation of n but not of n+1.

Terms

a(0) =23a(1) =123a(2) =223a(3) =239a(4) =323a(5) =423a(6) =523a(7) =623a(8) =723a(9) =823a(10) =923a(11) =1023a(12) =1123a(13) =1223a(14) =1239a(15) =1323a(16) =1423a(17) =1523a(18) =1623a(19) =1723a(20) =1823a(21) =1923a(22) =2023a(23) =2123a(24) =2223a(25) =2239a(26) =2399a(27) =2423a(28) =2523a(29) =2623