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a(n) = largest prime <= the smallest positive integer with exactly n divisors.
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%I #6 Apr 09 2014 10:16:34

%S 2,3,5,13,11,61,23,31,47,1021,59,4093,191,139,113,65521,179,262139,

%T 239,571,3067,4194301,359,1291,12281,887,953,268435399,719,1073741789,

%U 839,9209,196597,5179,1259,68719476731,786431,36857,1669,1099511627689,2879

%N a(n) = largest prime <= the smallest positive integer with exactly n divisors.

%C a(n) = largest prime <= A005179(n).

%F a(n) = A007917(A005179(n)). [From _Ray Chandler_, Oct 12 2008]

%Y A005179, A145344

%K nonn

%O 2,1

%A _Leroy Quet_, Oct 08 2008

%E More terms from _R. J. Mathar_ and _Ray Chandler_, Oct 10 2008