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 A226016 #18 Oct 28 2023 10:46:13
%S A226016 2,23,29,41,43,47,61,67,83,89,2129,2141,2143,2161,2309,2341,2347,2381,
%T A226016 2383,2389,2503,2521,2543,2549,2707,2729,2741,2749,2767,2789,2903,
%U A226016 2909,2927,2963,2969,4127,4129,4327,4349,4363,4507,4523,4547,4549,4561,4567,4583
%N A226016 Primes with alternate digits even and odd, and most significant digit even.
%C A226016 The only difference compared to A068887 is that the 3 is missing here. - _R. J. Mathar_, May 26 2013
%H A226016 Harvey P. Dale, <a href="/A226016/b226016.txt">Table of n, a(n) for n = 1..2000</a>
%e A226016 2143 is a member since its digits are alternatively even and odd.
%t A226016 a[n_,k_]:=Union[Boole/@EvenQ[Take[IntegerDigits[n],{k,-1,2}]]]; Join[{2},Select[Prime[Range[5,620]],{a[#,1],a[#,2]}=={{1},{0}} &]]
%t A226016 Select[Prime[Range[1000]],Boole[EvenQ[IntegerDigits[#]]]==PadRight[{},IntegerLength[#],{1,0}]&] (* _Harvey P. Dale_, Oct 28 2023 *)
%Y A226016 Cf. A000040, A030144.
%K A226016 nonn,base
%O A226016 1,1
%A A226016 _Jayanta Basu_, May 22 2013