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 A069680 #11 Jan 26 2023 15:07:40 %S A069680 2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89, %T A069680 97,151,157,251,257,353,359,457,557,653,659,751,757,853,857,859,953, %U A069680 1553,1559,2551,2557,3557,3559,5557,6551,6553,7559,9551,15551,15559,45553 %N A069680 Primes with either no internal digits or all internal digits are 5. %Y A069680 Cf. A069675, A069676, A069677, A069678, A069679, A069681, A069682, A069683, A069684. %K A069680 nonn,base %O A069680 1,1 %A A069680 _Amarnath Murthy_, Apr 06 2002 %E A069680 Offset corrected and name changed by _Arkadiusz Wesolowski_, Sep 07 2011