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

3, 11, 251, 2441406251, 56843418860808014869689941406251, 49303806576313237838233035330174139354575402194313937798142433166503906251

Offset

1,1

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..9

Mathematica

Select[2*5^Range[0, 500] + 1, PrimeQ]

Crossrefs

Cf. A058934

Sequence in context: A165946 A253639 A112357 * A097423 A111130 A337415

Adjacent sequences: A205768 A205769 A205770 * A205772 A205773 A205774

Keyword

nonn

Author

Vladimir Joseph Stephan Orlovsky, Jan 31 2012

Status

approved