%I
%S 3,4,5,10,137,216,381
%N Indices of primes whose Wilson quotients are also prime.
%C Is it a coincidence that the terms are alternately odd and even? Is it also a coincidence that the odd terms are all primes (= A225672)?
%H J. Sondow, <a href="http://arxiv.org/abs/1110.3113">Lerch Quotients, Lerch Primes, FermatWilson Quotients, and the WieferichnonWilson Primes 2, 3, 14771</a>, in Proceedings of CANT 2011, arXiv:1110.3113
%H J. Sondow, <a href="http://link.springer.com/chapter/10.1007%2F9781493916016_17">Lerch Quotients, Lerch Primes, FermatWilson Quotients, and the WieferichnonWilson Primes 2, 3, 14771</a>, Combinatorial and Additive Number Theory, CANT 2011 and 2012, Springer Proc. in Math. & Stat., vol. 101 (2014), pp. 243255.
%F a(n) = A000720(A050299(n+1)).
%e The Wilson quotient of 7 is ((71)!+1)/7 = 103, which is prime, and 7 is the 4th prime, so 4 is a member.
%Y Cf. A000720, A007619, A050299, A122696, A225672.
%K nonn
%O 1,1
%A _Jonathan Sondow_, May 20 2013
