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 A216816 #32 Jun 22 2025 17:31:38 %S A216816 3,7,23,43,47,67,83,103,107,127,163,167,223,227,263,283,307,347,367, %T A216816 383,443,463,467,487,503,523,547,563,587,607,643,647,683,727,743,787, %U A216816 823,827,863,883,887,907,947,967,983,1063,1087,1103,1123,1163,1187,1223,1283,1303,1307,1327,1367,1423,1427,1447,1483,1487 %N A216816 Duplicate of A122870. %K A216816 dead %O A216816 1,1