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 A290644 #20 Aug 10 2017 07:03:56 %S A290644 2718,1828,8793,8793,7093,7093,7093,7093,7093,7093,7093,7093,7093, %T A290644 7093,352,352,235,235,235,352,352,352,352,352,352,1661,352,352,352, %U A290644 352,352,1891,1891,1891,1891,1891,1891,352,3917,3917,3917,3917,3917,3917,3917,5065,8149,8149,8149,8149 %N A290644 First 4-digit number to appear n times in the decimal expansion of e. %C A290644 Some of the numbers start with 0. For example, a(15) is the 4-digit number 0352. %C A290644 The first two appearances of a(2) = 1828 appear consecutively as 18281828. %e A290644 a(2) = 1828 because 1828 is the first 4-digit number to appear 2 times in the decimal expansion of e = 2.7(1828)(1828)... %Y A290644 Cf. A001113, A195138, A276686, A277270, A290643. %K A290644 base,nonn %O A290644 1,1 %A A290644 _Bobby Jacobs_, Aug 08 2017