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 A093168 #18 Jul 08 2021 06:24:22 %S A093168 7,37,337,333337,3333333333333333333333333333333333333333333337 %N A093168 Primes of the form 30*R_k + 7, where R_k is the repunit (A002275) of length k. %C A093168 Primes of the form (3*10^k + 33)/9. - _Vincenzo Librandi_, Nov 16 2010 %H A093168 Makoto Kamada, <a href="https://stdkmd.net/nrr/3/33337.htm#prime">Prime numbers of the form 33...337</a>. %H A093168 <a href="/index/Pri#Pri_rep">Index entries for primes involving repunits</a> %Y A093168 Cf. A056680 (corresponding k), A099411, A173766. %K A093168 nonn %O A093168 1,1 %A A093168 _Rick L. Shepherd_, Mar 26 2004