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 A283158 #28 Jun 24 2025 10:42:06
%S A283158 1,85,555,1508,1781,4224,7037,43740
%N A283158 Numbers k such that A011544(k-1) is a prime.
%C A283158 For k <= 16000, there are seven primes in sequence A011544.
%C A283158 Round(e*10^112279) = floor(e*10^112279), and floor(e*10^112279) = A011544(112279) (=A007512(7)) is a prime. Thus 112280 = A064118(7) is also a term.
%H A283158 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/e-Prime.html">e-Prime</a>
%t A283158 Do[If[PrimeQ[Round[E*10^(n-1)]],Print[n]],{n,16000}]
%Y A283158 Cf. A007512, A011543, A011544, A064118.
%K A283158 nonn,base,more,hard
%O A283158 1,2
%A A283158 _XU Pingya_, Mar 01 2017
%E A283158 a(2) = 85 added by _Jason Yuen_, Jun 16 2025
%E A283158 a(8) from _Michael S. Branicky_, Jun 24 2025