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 A375213 #29 Sep 13 2024 07:40:46 %S A375213 10,12,14,16,18,30,32,34,36,38,50,52,54,56,58,70,72,74,76,78,90,92,94, %T A375213 96,98,1010,1012,1014,1016,1018,1030,1032,1034,1036,1038,1050,1052, %U A375213 1054,1056,1058,1070,1072,1074,1076,1078,1090,1092,1094,1096,1098,1100 %N A375213 Even numbers with equal numbers of even and odd digits. %C A375213 Numbers with an odd digit length cannot be in this sequence. %H A375213 Jake L Lande, <a href="/A375213/b375213.txt">Table of n, a(n) for n = 1..1000</a> %e A375213 1010 is even and has two even digits (0,0) and two odd digits (1,1). %t A375213 eeo[n_] := (id = IntegerDigits[n]; Count[EvenQ@id, True] == Count[OddQ@id, True]); Select[Select[Range[1100], eeo], Mod[#, 2] == 0 &] %Y A375213 Subsequence of A227870 and hence A001637. %Y A375213 Complement of A375214 within A227870. %K A375213 nonn,base,easy %O A375213 1,1 %A A375213 _Jake L Lande_, Aug 05 2024