Numbers k such that 2 and 3 occur juxtaposed in the base-10 representation of k but not of k+1.

Terms

a(0) =23a(1) =32a(2) =123a(3) =132a(4) =223a(5) =239a(6) =329a(7) =332a(8) =423a(9) =432a(10) =523a(11) =532a(12) =623a(13) =632a(14) =723a(15) =732a(16) =823a(17) =832a(18) =923a(19) =932a(20) =1023a(21) =1032a(22) =1123a(23) =1132a(24) =1223a(25) =1239a(26) =1329a(27) =1332a(28) =1423a(29) =1432