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 A228507 #16 Feb 16 2025 08:33:20 %S A228507 1,2,145,180,691,4123 %N A228507 Numbers n such that first n digits of A091723 (Decimal expansion of the root x of ExpIntegralEi[x]==0) gives a prime number. %C A228507 a(7) > 10^4. %H A228507 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/ConstantPrimes.html">Constant Primes</a> %H A228507 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/IntegerSequencePrimes.html">Integer Sequence Primes</a> %Y A228507 Cf. A091723. %K A228507 nonn,more,less,base %O A228507 1,2 %A A228507 _Robert Price_, Aug 23 2013