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Search: id:A124017
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| A124017 |
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Numbers n for which 2n-1, 4n-1, 8n-1, 16n-1 and 32n-1 are primes. |
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+0
7
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| 45, 90, 26820, 26925, 30705, 31710, 33375, 63420, 63570, 71805, 83865, 93075, 103185, 127140, 134025, 148050, 170460, 202635, 211035, 223305, 269505, 297225, 303660, 329175, 335625, 362505, 387975, 405270, 405405, 406425, 409755, 463335
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OFFSET
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1,1
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MATHEMATICA
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Select[15*Range[40000], And @@ PrimeQ /@ ({2, 4, 8, 16, 32}*# - 1) &] (*Chandler*)
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CROSSREFS
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Cf. A006254, A124485, A124493, A124494, A125113, A124514, A124515, A124516.
Sequence in context: A115827 A070002 A101794 this_sequence A121925 A044183 A044564
Adjacent sequences: A124014 A124015 A124016 this_sequence A124018 A124019 A124020
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KEYWORD
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nonn
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AUTHOR
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Artur Jasinski (grafix(AT)csl.pl), Nov 04 2006
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