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Primes p such that Lucas(prime(p)) is prime, where Lucas = A000032.
3

%I #12 Oct 30 2016 17:58:56

%S 3,5,7,11,13,71,113,643,769,13681,51929

%N Primes p such that Lucas(prime(p)) is prime, where Lucas = A000032.

%C These are the primes in A120561.

%C Numbers n such that Lucas(prime(n)) is prime are listed in A120561; indices of prime Lucas numbers are listed in A001606.

%F a(n) = prime(A123678(n)).

%F a(n) = pi(A277290(n)). - _Bobby Jacobs_, Oct 30 2016

%Y Cf. A000032, A123678, A120561, A001606, A119984, A122534, A277290.

%K hard,more,nonn

%O 1,1

%A _Alexander Adamchuk_, Oct 05 2006

%E 51929 found by _Henri Lifchitz_, from _Jens Kruse Andersen_, Jul 24 2014