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A093625
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Primes of the form (3^m + 1)/2.
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7
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OFFSET
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1,1
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COMMENTS
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Primes can only occur for m=2^k. The next term (if it exists) has k >= 21 (i.e., more than 10^6 decimal digits). - Don Reble, Apr 28 2004. [For the latest results about the search, see A171381. - N. J. A. Sloane, Jun 14 2010]
a(7) >= (3^(2^24) + 1)/2, if it exists. - Tyler Busby, Mar 22 2023
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LINKS
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EXAMPLE
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a(3)=41 because it can be written as (3^4 + 1)/2 = 82/2.
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CROSSREFS
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KEYWORD
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nonn,hard
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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