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 A046410 #8 Oct 10 2019 22:43:00 %S A046410 6666,22888822,66888866,413979314,2228668222,2668668662,2888668882, %T A046410 3315115133,6668228666,200446644002,222266662222,222446644222, %U A046410 224488884422,228866668822,244666666442,246664466642,246686686642 %N A046410 Palindromes with exactly 4 distinct palindromic prime factors. %Y A046410 Cf. A046330, A046378. %K A046410 nonn,base %O A046410 1,1 %A A046410 _Patrick De Geest_, Jun 15 1998 %E A046410 a(10)-a(17) from _Donovan Johnson_, Jul 20 2010