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A205771 Primes of the form 2*5^n+1. 3

%I

%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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Last modified October 29 12:00 EDT 2020. Contains 338066 sequences. (Running on oeis4.)