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 A091117 #13 Feb 16 2025 08:32:52 %S A091117 2,7,47,309,2412,19622,166212,1440496,12712315,113764040,1029518338, %T A091117 9401997001 %N A091117 Number of primes of the form 5k+2 less than 10^n. %C A091117 Computed by _T. D. Noe_, Dec 19 2003. %H A091117 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/ModularPrimeCountingFunction.html">Modular Prime Counting Function</a>. %Y A091117 Cf. A045380. %K A091117 nonn,more %O A091117 1,1 %A A091117 _Eric W. Weisstein_, Dec 19 2003 %E A091117 a(10) from _Robert G. Wilson v_, Dec 22 2003 %E A091117 a(11)-a(12) from _Amiram Eldar_, Apr 12 2022