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 A349888 #9 Feb 19 2022 10:36:21
%S A349888 3,7,12,13,14,15,16,21,25,28,29,33,37,43,47,53,57,63,67,70,72,74,76,
%T A349888 81,85,88,89,91,95,98,99,100,102,104,106,130,132,134,136,140,142,144,
%U A349888 146,150,152,154,156,160,162,164,166,201,205,208,209,210,220,222,224,226,231,235,238,239
%N A349888 Numbers which, when written in English, contain exactly two instances of the letter E.
%H A349888 Michael S. Branicky, <a href="/A349888/b349888.txt">Table of n, a(n) for n = 1..10000</a>
%e A349888 THREE has two Es (and is thus in the sequence), FOUR has no E, FIVE has only one, SIX has none, SEVEN has two Es (and is thus in the sequence). Etc.
%o A349888 (Python)
%o A349888 from num2words import num2words
%o A349888 def ok(n): return num2words(n).count("e") == 2
%o A349888 print([k for k in range(311) if ok(k)]) # _Michael S. Branicky_, Feb 19 2022
%Y A349888 Cf. A006933 ('Eban' numbers) and A349887 (exactly one instance).
%K A349888 word,nonn
%O A349888 1,1
%A A349888 _Eric Angelini_, Dec 04 2021
%E A349888 a(7) = 16 inserted by _Michael S. Branicky_, Feb 19 2022