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%I #10 Jan 07 2015 18:24:57
%S 2,3,7,19,47,83,487
%N Primes p such that (2p)! - 1 is also prime.
%C Corresponding primes of the form (2p)! - 1 are {23,719,87178291199,523022617466601111760007224100074291199999999,...}.
%C No other terms < 20663. - _Robert Price_, Mar 02 2012
%Y Cf. A002982, A103317.
%K hard,more,nonn
%O 1,1
%A _Alexander Adamchuk_, Sep 23 2006
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