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 A030472 #12 Feb 18 2024 02:04:29 %S A030472 2,67,83,139,149,383,503,557,577,587,601,613,727,937,1181,1259,1451, %T A030472 1453,1489,1531,1621,1657,1831,1879,1907,2269,2441,2531,2897,3191, %U A030472 3709,3779,4057,4153,4373,4603,4871,5197,5233,5261,5279,5417,5711 %N A030472 Primes which when concatenated with next 3 primes are also prime. %H A030472 Paolo P. Lava, <a href="/A030472/b030472.txt">Table of n, a(n) for n = 1..1500</a> %Y A030472 Cf. A000040. %K A030472 nonn,base %O A030472 1,1 %A A030472 _Patrick De Geest_