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 A093676 #12 Jul 08 2021 06:01:33 %S A093676 83,83333333,833333333333333333333333,833333333333333333333333333333 %N A093676 Primes of the form 8*10^k + 3*R_k, where R_k is the repunit (A002275) of length k. %H A093676 Makoto Kamada, <a href="https://stdkmd.net/nrr/8/83333.htm#prime">Prime numbers of the form 833...33</a>. %H A093676 <a href="/index/Pri#Pri_rep">Index entries for primes involving repunits</a> %Y A093676 Cf. A002275, A056723 (corresponding k). %K A093676 nonn %O A093676 1,1 %A A093676 _Rick L. Shepherd_, Apr 08 2004