%I #18 Dec 02 2013 17:51:17
%S 6,12,18,20,24,28,30,36,40,42,48,54,56,60,66,70,72,78,80,84,88,90,96,
%T 100,102,104,108,112,114,126,132,138,140,144,150,156,160,162,168,174,
%U 176,186,192,196,198,200,204,208,210,216,220,222,224,228,234,246,252
%N Numbers with abundancy 2 <= a < 3.
%C Numbers m such that 2 <= sigma(m) / m < 3.
%C Supersequence of A000396 (perfect numbers).
%H Jaroslav Krizek and T. D. Noe, <a href="/A204829/b204829.txt">Table of n, a(n) for n = 1..1000</a>
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/Abundancy.html">Abundancy</a>
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/AbundantNumber.html">Abundant Number</a>
%e Number 70 is in sequence because sigma(70) / 70 = 144 / 70, which is between 2 and 3.
%Y Cf. A204828 (abundant numbers with abundancy 3 <= a < 4).
%K nonn
%O 1,1
%A _Jaroslav Krizek_, Jan 22 2012