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 A227530 #54 Feb 16 2025 08:33:20 %S A227530 1,2,4,11,353,355,499,1171,1543,5719,11048,68433,97855,292447 %N A227530 Integer lengths of the n-th Copeland-Erdős prime (concatenation of the first n entries (digits) of A033308 is prime). %C A227530 a(15) > 300000. - _Eric W. Weisstein_ (according to Mark Rodenkirch as of Dec 13 2015) %C A227530 The larger of these are probable primes. %C A227530 a(15) > 5*10^5 according to Mark Rodenkirch, June 2016. - _M. F. Hasler_, Apr 24 2017 %H A227530 Mark Rodenkirch (a.k.a. "rogue"), <a href="http://www.mersenneforum.org/showthread.php?p=436494">Copeland-Erdos Constant Primes</a>, MersenneForum.org, June 2016. %H A227530 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Copeland-ErdosConstantDigits.html">Copeland-Erdős Constant Digits</a> %Y A227530 Cf. A227529 (primes corresponding to a(n) digits of the Copeland-Erdős constant), A019518, A069151. %Y A227530 Cf. also A033308 (Decimal expansion of Copeland-Erdős constant: concatenate primes). %K A227530 nonn,hard,base %O A227530 1,2 %A A227530 _Eric W. Weisstein_, Jul 14 2013 %E A227530 a(12) = 68433 from _Eric W. Weisstein_, Aug 17 2013 %E A227530 a(13) = 97855 from _Eric W. Weisstein_, Oct 24 2015 %E A227530 a(14) = 292447 from _Eric W. Weisstein_, Dec 17 2015