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%I #10 Mar 30 2012 18:52:15
%S 3,11,251,2441406251,56843418860808014869689941406251,
%T 49303806576313237838233035330174139354575402194313937798142433166503906251
%N Primes of the form 2*5^n+1.
%H Vincenzo Librandi, <a href="/A205771/b205771.txt">Table of n, a(n) for n = 1..9</a>
%t Select[2*5^Range[0, 500] + 1, PrimeQ]
%Y Cf. A058934
%K nonn
%O 1,1
%A _Vladimir Joseph Stephan Orlovsky_, Jan 31 2012
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