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a(n) is a power of its number of divisors.
4

%I #3 Mar 31 2012 20:17:55

%S 1,2,9,625,6561,21952,64000,117649,4100625,25937424601,23298085122481,

%T 29192926025390625,59604644775390625,300283484326400961,

%U 48661191875666868481,104127350297911241532841

%N a(n) is a power of its number of divisors.

%H D. W. Wilson, <a href="/A180936/b180936.txt">Table of n, a(n) for n=1..278</a>

%e a(5) = 6561 = 9^4 has 9 divisors.

%e a(12) = 29192926025390625 = 225^7 has 225 divisors.

%Y Cf. A000005, A180934, A180935.

%K nonn

%O 1,2

%A _David W. Wilson_, Sep 26 2010