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 A277270 #49 Sep 11 2017 08:38:50 %S A277270 27,18,28,35,66,66,66,74,7,74,74,93,93,93,93,93,93,93,93,93,93,93,93, %T A277270 93,25,25,25,25,44,25,44,44,44,44,96,96,63,63,25,96,25,96,63,63,63,36, %U A277270 36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36 %N A277270 First 2-digit number to appear n times in the decimal expansion of e. %C A277270 a(9) is the 2-digit number 07. %H A277270 Alois P. Heinz, <a href="/A277270/b277270.txt">Table of n, a(n) for n = 1..10000</a> %e A277270 a(2) = 18 because 18 is the first 2-digit number to appear 2 times in the decimal expansion of e = 2.7(18)28(18)... %Y A277270 Cf. A001113, A195138, A276992, A290643, A290644. %K A277270 nonn,base %O A277270 1,1 %A A277270 _Bobby Jacobs_, Nov 05 2016