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 A157035 #8 Dec 28 2023 15:30:03 %S A157035 7,97,9973,99999989,9999999999999937,99999999999999999999999999999979, %T A157035 9999999999999999999999999999999999999999999999999999999999999949 %N A157035 Largest prime with 2^n digits. %t A157035 NextPrime[10^2^Range[0,6],-1] (* _Harvey P. Dale_, Dec 28 2023 *) %Y A157035 Cf. A157036, A003618, A157033, A157034. %K A157035 nonn,base %O A157035 0,1 %A A157035 _Lekraj Beedassy_, Feb 22 2009