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Euler's totient of prime(n)! / prime(n)# + 1.
3

%I #10 Feb 13 2020 08:59:49

%S 1,1,4,20,15700,161520,659739168,11887243200,115875912594352,

%T 1360481062410358294032,40999220870977029249072,

%U 1854483563489396099991763032000,106016408292727234808287504322403328

%N Euler's totient of prime(n)! / prime(n)# + 1.

%H Amiram Eldar, <a href="/A103896/b103896.txt">Table of n, a(n) for n = 1..30</a>

%H Reinhard Zumkeller, <a href="/A103890/a103890.txt">p(n)!/p(n )#+1</a>

%F a(n) = A000010(A103890(n)).

%Y Cf. A000010, A103861, A103890.

%K nonn

%O 1,3

%A _Reinhard Zumkeller_, Feb 20 2005