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 A304652 #19 May 26 2018 22:30:06
%S A304652 23571,35711,57111,71113,11131,11317,13171,31719,17192,71923,19232,
%T A304652 92329,23293,32931,29313,93137,31374,13741,37414,74143,41434,14347,
%U A304652 43475,34753,47535,75359,53596,35961,59616,96167,61677,16771,67717,77173,71737,17379,73798,37983,79838,98389
%N A304652 Digits of the Copeland-Erdős constant taken in groups of five digits.
%C A304652 This sequence is presented by the Foo Bar Challenge, a recruitment tool for Google, as the challenge to renumber some entities with 5-digit ID numbers taken from the first 10004 places of the Copeland-Erdős constant.
%C A304652 The ID numbers are to be left zero-padded as needed to ensure they all consist of five digits. Of course here in the OEIS leading zeros will just be dropped.
%C A304652 The Foo Bar Challenge statement of the problem says nothing of the fact that there are duplicates among these well before 10000.
%t A304652 numCopelandErdos = Flatten[IntegerDigits[Prime[Range[1000]]]]; Table[FromDigits[numCopelandErdos[[n ;; (n + 4)]]], {n, Length[numCopelandErdos] - 4}]
%Y A304652 Cf. A033308, A068670.
%K A304652 nonn,base
%O A304652 1,1
%A A304652 _Alonso del Arte_, May 16 2018