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 A069219 #7 Aug 11 2024 14:41:34 %S A069219 4,9,12,8,10,12,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,1 %N A069219 Number of cyclic primes with n digits. %C A069219 Every prime repunit is also a cyclic prime. %H A069219 P. De Geest, <a href="https://www.worldofnumbers.com/circular.htm">Circular Primes</a> %Y A069219 Cf. A004022, A004023, A068652. %K A069219 nonn,base %O A069219 1,1 %A A069219 _Martin Renner_, Apr 12 2002 %E A069219 More terms from De Geest link by _Ray Chandler_, May 04 2017