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Search: id:A153133
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| A153133 |
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Primes of the form 2^n+3^(n-1). |
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+0
1
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| 3, 7, 17, 43, 113, 307, 857, 20707, 181243, 539633, 14414443, 129402307, 31389448217, 1853028778786433, 5559077746424707, 50031613818476443, 150094772735952593, 8862938260389989451257, 26588814640432479998443
(list; graph; listen)
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OFFSET
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1,1
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MATHEMATICA
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lst={}; Do[p=2^n+3^(n-1); If[PrimeQ[p], AppendTo[lst, p]], {n, 0, 5!}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Jun 15 2009]
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CROSSREFS
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Cf. A104066 (primes of the form 2^n+7), A057195 (numbers n such that 2^n+7 is prime). [From Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Mar 14 2009]
Sequence in context: A078679 A025577 A085279 this_sequence A123601 A115325 A018025
Adjacent sequences: A153130 A153131 A153132 this_sequence A153134 A153135 A153136
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KEYWORD
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nonn
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AUTHOR
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Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Mar 11 2009
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EXTENSIONS
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Added more terms and Mathematica program. Vladimir Orlovsky (4vladimir(AT)gmail.com), Jun 15 2009
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