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Search: id:A059242
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| A059242 |
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Numbers n such that 2^n + 5 is prime. |
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+0
8
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| 1, 3, 5, 11, 47, 53, 141, 143, 191, 273, 341, 16541
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OFFSET
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1,2
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COMMENT
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2^p+5 is prime for p=(3, 5, 11, 47, 53, 191) [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Jan 27 2009]
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EXAMPLE
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2^3 + 5 = 13 is prime but 2^4 + 5 = 21 is not.
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CROSSREFS
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Sequence in context: A105236 A144467 A049883 this_sequence A004203 A088884 A058029
Adjacent sequences: A059239 A059240 A059241 this_sequence A059243 A059244 A059245
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KEYWORD
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nonn,hard
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AUTHOR
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Tony Davie (ad(AT)dcs.st-and.ac.uk), Jan 21 2001
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EXTENSIONS
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More terms from Santi Spadaro, Oct 04, 2002
16541 from Hans Havermann, Oct 07 2002
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