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 A228226 #22 Feb 16 2025 08:33:20 %S A228226 321,466,1271,15690,18872,89973 %N A228226 Integer lengths of log(2)-primes: numbers n such that the concatenation of the first n decimal digits of log(2) is prime. %C A228226 No others <= 90220 - _Eric W. Weisstein_, Oct 28 2015 %H A228226 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/ConstantPrimes.html">Constant Primes</a> %H A228226 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/IntegerSequencePrimes.html">Integer Sequence Primes</a> %H A228226 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/NaturalLogarithmof2Digits.html">Natural Logarithm of 2 Digits</a> %e A228226 log(2) = 0.6931471805... and the 321-digit number 6931...0641 is the smallest prime in the first digits, so a(1) = 321 %Y A228226 Cf. A002162 (decimal digits of log(2)). %K A228226 nonn,base,hard %O A228226 1,1 %A A228226 _Eric W. Weisstein_, Aug 17 2013 %E A228226 a(6) from _Eric W. Weisstein_, Oct 28 2015