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 A103755 #2 Mar 31 2012 14:11:37 %S A103755 1,1,3,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,2,1,1,1,1,1,1,1,2,5,2,2,2,2, %T A103755 2,2,2,1,1,2,1,1,1,1,1,1,1,1,1,2,1,1,1,1,1,1,1,1,1,2,1,1,1,1,1,1,1,1, %U A103755 1,2,1,1,1,1,1,1,1,1,1,2,1,1,1,1,1,1,1,1,1,2,1,1,1,1,1,1,1,1,1,2,1,1,1,1,1 %N A103755 Number of contiguous digits i in the counting numbers, for i=1. %C A103755 Write the natural numbers as an infinite sequence of digits, starting at the left; and count the digits of each group of "1"'s you encounter (the smallest "groups" have one "1"). %e A103755 a(1)=1: the first "1" of the counting numbers, isolated. %e A103755 a(2)=1: the second "1", first digit of number 10, isolated. %e A103755 a(3)=3 two "1"'s of 11 and one "1" of 12 = three "1"'s, the next group of "1"'s. %K A103755 base,easy,nonn %O A103755 1,3 %A A103755 _Alexandre Wajnberg_, Mar 28 2005