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 A030475 #12 Oct 18 2023 11:52:39
%S A030475 2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,
%T A030475 97,113,131,137,139,151,157,173,179,191,193,197,199,211,223,227,229,
%U A030475 233,239,241,251,257,263,269,271,277,281,283,293,311,313,317
%N A030475 Primes with property that all even digits occur together and all odd digits occur together.
%H A030475 Robert Israel, <a href="/A030475/b030475.txt">Table of n, a(n) for n = 1..10000</a>
%p A030475 filter:= proc(n) local L; L:= convert(n,base,10) mod 2;
%p A030475 not member(-1,L[1..-2]-L[2..-1])
%p A030475 end proc:
%p A030475 select(filter, [seq(ithprime(i),i=1..1000)]);
%t A030475 With[{upto=100},Select[Prime[Range[upto]],Length[SplitBy[IntegerDigits[#],Mod[#,2]&]]<3&]] (* _Paolo Xausa_, Oct 18 2023 *)
%Y A030475 Cf. A030476, A030480.
%K A030475 nonn,base
%O A030475 1,1
%A A030475 _Patrick De Geest_
%E A030475 Offset changed by _Robert Israel_, Oct 17 2023