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 #7 Mar 04 2018 17:45:33
%S 1,1,1,1,1,1,1,1,2,2,2,2,6,6,6,6,12,12,12,12,60,60,60,60,60,60,60,60,
%T 420,420,420,420,840,840,840,840,2520,2520,2520,2520,2520,2520,2520,
%U 2520,27720,27720,27720,27720,27720,27720,27720,27720,360360,360360
%N a(n) = lcm(1..floor(n/4)).
%C Row products of A139553.
%t Join[{1,1,1,1},Table[LCM@@Range[Floor[n/4]],{n,4,60}]] (* _Harvey P. Dale_, May 24 2012 *)
%Y Cf. A139553, A003418.
%K nonn
%O 0,9
%A _Mats Granvik_, Apr 27 2008