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 A052090 #7 Oct 17 2019 22:05:04 %S A052090 98689,9686869,9809089,9888889,9889889,9896989,9908099,9980899, %T A052090 9989899,900808009,906686609,906868609,906989609,908000809,908060809, %U A052090 908808809,908888809,909868909,960898069,968606869,968666869,968868869,968898869 %N A052090 Palindromic primes whose digits contain circles. %Y A052090 Cf. A053580. %K A052090 nonn,base %O A052090 1,1 %A A052090 _Patrick De Geest_, Jan 15 2000