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 A334131 #11 Feb 16 2025 08:34:00 %S A334131 0,1,11,111,1111,1221,11111,12221,111111,122221,123321,1111111, %T A334131 1222221,1233321,1356531,11111111,12222221,12333321,12344321,13566531, %U A334131 111111111,122222221,123333321,123444321,135666531,135787531,1111111111,1222222221 %N A334131 Numbers that can be written as a product of distinct repunits. %H A334131 David A. Corneth, <a href="/A334131/b334131.txt">Table of n, a(n) for n = 1..10000</a> %H A334131 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Repunit.html">Repunit</a> %e A334131 13566531 = 11*111*11111. - _David A. Corneth_, Mar 26 2021 %Y A334131 Cf. A000042, A002275, A015009, A077488, A083278, A308365. %K A334131 nonn,base %O A334131 1,3 %A A334131 _Ilya Gutkovskiy_, Apr 14 2020