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 A243981 #22 Feb 14 2022 21:28:34
%S A243981 1,2,0,4,1,6,0,0,3,10,1,12,5,2,0,16,1,18,1,4,9,22,1,0,11,0,3,28,1,30,
%T A243981 0,8,15,2,0,36,17,10,3,40,1,42,7,2,21,46,1,0,3,14,9,52,1,6,1,16,27,58,
%U A243981 2,60,29,2,0,8,5,66,13,20,3,70,1,72,35,2,15,4,7,78,1,0,39,82,4,12,41,26,3,88,1,6,19,28,45,14,1,96,5,2,0
%N A243981 Minimum range of sets of natural numbers with a product of n.
%C A243981 The minimum difference between the largest and smallest values in the sets of positive integers with a product of n, excluding the singleton set {n}.
%H A243981 Alois P. Heinz, <a href="/A243981/b243981.txt">Table of n, a(n) for n = 2..10000</a>
%F A243981 a(n) <= A046665(n) for all composite n, a(p) = p - 1 for primes p. - _Charlie Neder_, Jan 13 2019
%e A243981 For 45 the sets are {1,45}, {3,15}, {5,9}, {3,3,5} with differences of 44, 12, 4 and 2 respectively. 2 is the minimum and so a(45) = 2.
%Y A243981 Cf. A056737, A060794, A076388, A082119.
%K A243981 nonn,look
%O A243981 2,2
%A A243981 _Paul Richards_, Nov 11 2014