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 A228127 #27 Feb 16 2025 08:33:20
%S A228127 1,2,3,1080
%N A228127 Numbers n such that first n digits of A091724 (Decimal expansion of E^(2*EulerGamma)) gives a prime number.
%C A228127 a(5) > 10^4.
%H A228127 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/ConstantPrimes.html">ConstantPrimes</a>
%H A228127 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/IntegerSequencePrimes.html">IntegerSequencePrimes</a>
%t A228127 nn=1100;With[{c=RealDigits[E^(2*EulerGamma),10,nn][[1]]},Select[ Range[ nn], PrimeQ[FromDigits[Take[c,#]]]&]] (* _Harvey P. Dale_, Nov 13 2014 *)
%Y A228127 Cf. A091724.
%K A228127 nonn,more,base
%O A228127 1,2
%A A228127 _Robert Price_, Aug 26 2013