This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A143712 #24 Aug 06 2022 18:54:48
%S A143712 21,23,25,27,29,41,43,45,47,49,61,63,65,67,69,81,83,85,87,89,201,203,
%T A143712 205,207,209,221,223,225,227,229,241,243,245,247,249,261,263,265,267,
%U A143712 269,281,283,285,287,289,401,403,405,407,409,421,423,425,427,429,441,443,445,447
%N A143712 Numbers with at least two digits in which all digits except the rightmost are even and the rightmost is odd.
%C A143712 These are called e-type numbers, cf. A163396.
%H A143712 Harvey P. Dale, <a href="/A143712/b143712.txt">Table of n, a(n) for n = 1..1000</a>
%H A143712 <a href="/index/Ca#CARRYLESS">Index entries for sequences related to carryless arithmetic</a>
%t A143712 Select[Range[21, 500], (id = IntegerDigits[#1]; And @@ EvenQ /@ Most[id] && OddQ[Last[id]]) & ] (* _Jean-François Alcover_, May 23 2013 *)
%t A143712 eodQ[n_]:=Module[{td=TakeDrop[IntegerDigits[n],-1]},OddQ[td[[1,1]]]&&AllTrue[ td[[2]],EvenQ]]; Select[Range[10,500],eodQ] (* _Harvey P. Dale_, Aug 06 2022 *)
%Y A143712 Cf. A144162, A163396, A169984.
%K A143712 nonn,base
%O A143712 1,1
%A A143712 _David Applegate_, _Marc LeBrun_ and _N. J. A. Sloane_, Aug 24 2010