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 A258254 #12 Mar 13 2018 04:08:02 %S A258254 1,2,3,1,4,3,5,2,7,5,5,6,7,1,8,6,9,3,11,8,5,12,7,9,11,2,13,11,11,14, %T A258254 17,3,7,4,5,11,6,13,7,8,9,10,11,12,13,1,16,12,9,15,7,20,13,19,6,17,11, %U A258254 16,5,14,9,13,4,11,7,17,10,13,3,23,20,17,17,12,19,7,16,9,20 %N A258254 Denominators of partial sums of 1/A258252(i), 1 <= i <= n. %C A258254 Presumably, every natural number appears infinitely many times. %C A258254 A258252(n) is a divisor of lcm(a(n-1), a(n)). The first case when it is a proper divisor (rather than that number itself) occurs at n=169. %H A258254 Ivan Neretin, <a href="/A258254/b258254.txt">Table of n, a(n) for n = 1..25000</a> %Y A258254 Cf. A258252, A002805 (analog for harmonic series). %K A258254 nonn %O A258254 1,2 %A A258254 _Ivan Neretin_, May 24 2015