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Least term of A004767 with exactly 2n divisors.
3

%I #5 Mar 30 2012 17:30:04

%S 3,15,63,135,567,315,5103,1155,1575,2835,413343,4095,3720087,25515,

%T 14175,10395,301327047,20475,2711943423,36855,127575,2066715,

%U 219667417263,51975,354375,18600435,121275,331695,160137547184727,184275,1441237924662543,135135

%N Least term of A004767 with exactly 2n divisors.

%C For odd prime p, a(p) = 3^(p-1)*7.

%H Ray Chandler, <a href="/A204086/b204086.txt">Table of n, a(n) for n = 1..2098</a> (a(2099) exceeds 1000 digits).

%F a(n) = min{d|n: A018782(d) * A204046(n/d)}.

%F a(n) = 4*A078714(n)-1.

%Y Cf. A004767, A018782, A204046, A078714.

%K nonn

%O 1,1

%A _Ray Chandler_, Jan 10 2012