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 A107154 #21 Jul 14 2019 14:02:02 %S A107154 3,19,43,67,139,163,211,283,307,331,379,499,523,547,571,619,643,691, %T A107154 739,787,811,859,883,907,1051,1123,1171,1291,1459,1483,1531,1579,1627, %U A107154 1699,1723,1747,1867,1987,2011,2083,2131,2179,2203,2251,2347,2371 %N A107154 Duplicate of A141373. %K A107154 dead %O A107154 1,1