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 A048970 #9 Feb 16 2025 08:32:40 %S A048970 19,47,61,197,1084051,74596893730427 %N A048970 Prime Keith numbers. %H A048970 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/KeithNumber.html">Keith Number.</a> %Y A048970 Cf. A007629. %K A048970 base,nonn %O A048970 1,1 %A A048970 _G. L. Honaker, Jr._