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%I #12 Aug 27 2020 03:36:35
%S 2,3,23,193,1697,15907,161773,1777543,21084257,269475737,3696588877,
%T 54223012561,847458120167,14065357995331,247134401977037,
%U 4583801628003613,89514011909036503,1836054207193376321
%N a(n) = prime(!n), where !n is subfactorial n.
%H Kim Walisch, <a href="https://github.com/kimwalisch/primecount">Fast C++ prime counting function implementation (primecount)</a>.
%F a(n) = A000040(A000166(n)). - _Amiram Eldar_, Aug 27 2020
%e a(3) = 23,because !4 = 9 and the 9th prime is 23.
%t Prime[Subfactorial[Range[2,15]]] (* _Harvey P. Dale_, Nov 11 2011 *)
%Y Cf. A000040, A000166, A126701.
%K nonn,hard,more
%O 2,1
%A _Shyam Sunder Gupta_, Feb 11 2007
%E a(16)-a(19) using Kim Walisch's primecount, from _Amiram Eldar_, Aug 27 2020