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 A199982 #20 May 31 2025 19:43:39
%S A199982 1113,1131,1311,3111,13111,31111,111113,111131,111311,1111113,1111131,
%T A199982 1111311,1113111,1131111,1311111,3111111,11111113,11311111,13111111,
%U A199982 31111111,111111311,111131111,111311111,113111111,311111111,1111111113,1111111131,1111111311
%N A199982 Composite numbers with digital product = 3.
%C A199982 Also composite numbers whose multiplicative digital root is 3. Complement of A107689 with respect to A034050.
%H A199982 Harvey P. Dale, <a href="/A199982/b199982.txt">Table of n, a(n) for n = 1..10000</a>
%t A199982 Table[Select[FromDigits[Permutations[PadRight[{3},n,1]]],CompositeQ],{n,4,10}]//Flatten//Sort (* _Harvey P. Dale_, May 31 2025 *)
%Y A199982 Cf. A107689 (primes with digital product = 3).
%Y A199982 Cf. A034050 (numbers with digital product = 3).
%K A199982 nonn,base
%O A199982 1,1
%A A199982 _Jaroslav Krizek_, Nov 13 2011
%E A199982 Incorrect 111113111 removed by _Sean A. Irvine_, Jan 06 2025