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 A118327 #8 Feb 16 2025 08:33:01 %S A118327 1,407,878,4443,4981,6551,13386,28433 %N A118327 Khinchin primes: values of n such that the concatenation of the first n decimal digits of Khinchin's constant is prime. %H A118327 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/ConstantPrimes.html">Constant Primes</a> %H A118327 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/KhinchinsConstantDigits.html">Khinchin's Constant Digits</a> %H A118327 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/IntegerSequencePrimes.html">Integer Sequence Primes</a> %e A118327 K = 2.685..., 2--the concatenation of the first 1 decimal digits--is prime, so a(1)=1 %Y A118327 Cf. A002210. %K A118327 nonn,base %O A118327 1,2 %A A118327 _Eric W. Weisstein_, Apr 24 2006; corrected Apr 26 2006 %E A118327 More terms from _Eric W. Weisstein_, Apr 28 2006 %E A118327 a(8) = 28433 from _Eric W. Weisstein_, Apr 27 2006