A088726 - OEIS

%I #7 Mar 30 2012 18:50:38

%S 1,6,12,72,60,180,360,420,840,1260,3780,2520,5040,13860,36960,41580,

%T 27720,55440,83160,166320,277200,491400,471240,360360,1113840,720720,

%U 1081080,3341520,2162160,2827440,5405400,4324320,12972960,6126120

%N Smallest numbers having exactly n divisors d>1 such that also d+1 is a divisor.

%C A088722(a(n))=n, A088722(k)<>n, for n<a(n).

%H Ray Chandler, <a href="/A088726/b088726.txt">Table of n, a(n) for n=0..57</a>

%F a(n) = 2*A130317(n+1) for n>0. - Chandler

%Y Cf. A088722, A088723, A088724, A088725.

%K nonn

%O 0,2

%A _Reinhard Zumkeller_, Oct 12 2003

%E Extended by _Ray Chandler_, May 29 2008