Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #15 May 31 2019 11:33:53
%S 1,4,6,12,24,30,60,120,180,210,360,420,840,1260,2520,4620,9240,13860,
%T 27720,55440,60060,120120,180180,360360,720720,1441440,1801800,
%U 2042040,3063060,6126120,12252240,24504480,30630600,36756720,38798760
%N Lowest outliers for A057660.
%C A057660(n) is a multiplicative function bounded above by n*(n-1)+1, which is reached whenever n is 1 or prime. These numbers are the n such that the ratio between A057660(n) and the upper bound reaches a record low.
%C Motivated by _Daniel Forgues_'s conjecture that this sequence consists of 4 and A051451.
%C A subsequence of A025487.
%H Charlie Neder, <a href="/A308471/b308471.txt">Table of n, a(n) for n = 1..215</a>
%e A057660(60060)/(60060*60059+1) = 1211716737/3607143541 ~ 0.3359214, and every number less than 60060 has a ratio > 0.34, so 60060 is in this sequence.
%Y Cf. A057660, A025487, A051451.
%K nonn
%O 1,2
%A _Charlie Neder_, May 29 2019