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%I #8 Mar 30 2012 18:52:15
%S 3,13,73,433,2593,120932353,725594113,33853318889473,7312316880125953,
%T 12281884428929630994433,160409934466124808814066151718913,
%U 44904515414709114480174422247585349633,452534055376752384160395854386801887645007873
%N Primes of the form 2*6^n+1.
%H Vincenzo Librandi, <a href="/A205776/b205776.txt">Table of n, a(n) for n = 1..19</a>
%t Select[2*6^Range[0, 500] + 1, PrimeQ]
%Y Cf. A120023, A205771
%K nonn
%O 1,1
%A _Vladimir Joseph Stephan Orlovsky_, Jan 31 2012