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 A046417 #19 Feb 16 2025 08:32:39 %S A046417 15,16,26,33,34,39,46,57,69,76,79,93,94,106,118,121,133,169,181,278, %T A046417 281,293 %N A046417 Repunit of length a(n) has exactly 6 prime factors (counted with multiplicity). %H A046417 P. De Geest, <a href="https://www.worldofnumbers.com/repunits.htm">Repunits prime factors</a> %H A046417 Makoto Kamada, <a href="https://stdkmd.net/nrr/repunit/">Factorizations of 11...11 (Repunit)</a> %H A046417 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Repunit.html">Repunit</a> %Y A046417 Cf. A000042, A001222, A002275, A004022, A004023, A046053. %K A046417 nonn,base,more %O A046417 1,1 %A A046417 _Patrick De Geest_, Jul 15 1998 %E A046417 More terms from _Robert Gerbicz_, Nov 22 2010 %E A046417 a(20) from _Bo Gyu Jeong_, Jun 30 2012 %E A046417 a(21)-a(22) from _Ray Chandler_, Apr 23 2017