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 A031921 #13 May 04 2020 16:51:40 %S A031921 541,1223,1987,2741,3571,4409,5279,6133,6997,7919,8831,9733,10657, %T A031921 11657,12553,13499,14519,15401,16381,17389,18313,19423,20357,21383, %U A031921 22307,23321,24281,25391,26399,27449,28499,29443,30559,31601,32609 %N A031921 a(n) = prime(100*n). %H A031921 Ivan Panchenko, <a href="/A031921/b031921.txt">Table of n, a(n) for n = 1..1000</a> %o A031921 (PARI) a(n) = prime(100*n); \\ _Michel Marcus_, Jun 12 2014 %K A031921 nonn %O A031921 1,1 %A A031921 _Jeff Burch_