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A205771
Primes of the form 2*5^n+1.
3
3, 11, 251, 2441406251, 56843418860808014869689941406251, 49303806576313237838233035330174139354575402194313937798142433166503906251
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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
*
A373342
A097423
A111130
Adjacent sequences:
A205768
A205769
A205770
*
A205772
A205773
A205774
KEYWORD
nonn
AUTHOR
Vladimir Joseph Stephan Orlovsky
, Jan 31 2012
STATUS
approved
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Last modified August 30 17:27 EDT 2024. Contains 375545 sequences. (Running on oeis4.)