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 A086049 #12 Feb 16 2025 08:32:50
%S A086049 2,3,4,5,6,8,10,12,2,16,9,20,22,24,26,28,30,32,34,5,38,40,42,44,46,48,
%T A086049 51,54,57,7,63,8,19,72,75,78,81,84,33,37,93,96,99,102,105,108,111,114,
%U A086049 117,120,123,126,129,132,135,138,141,64,147,150,153,16,159,67,18
%N A086049 Position of first occurrence of n-th prime in concatenated primes (A033308, Copeland-Erdos constant).
%C A086049 A033308(a(n)) = A000030(A000040(n));
%C A086049 A033308(a(n)+i) = A033307(A086044(A000040(n))+i), 0 <= i < A055642(A000040(n)).
%H A086049 Robert Israel, <a href="/A086049/b086049.txt">Table of n, a(n) for n = 1..10000</a>
%H A086049 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Copeland-ErdosConstant.html">Copeland-Erdos Constant</a>
%p A086049 N:= 100: # for a(1)..a(N)
%p A086049 S:= cat(".",seq(ithprime(i),i=1..N)):
%p A086049 seq(StringTools:-Search(convert(ithprime(i),string),S),i=1..N); # _Robert Israel_, Jun 28 2019
%Y A086049 Cf. A033307, A033308, A086044, A086048, A086050.
%K A086049 nonn,base,look
%O A086049 1,1
%A A086049 _Reinhard Zumkeller_, Jul 07 2003