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Search: id:A124515
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| A124515 |
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Numbers n for which 2n-1, 4n-1, 8n-1, 16n-1, 32n-1, 64n-1, 128n-1 and 256n-1 are primes. |
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+0
7
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| 9549960, 26277285, 42932385, 85864770, 99239790, 113183070, 152596290, 172159515, 198479580, 237059175, 287482065, 305192580, 342533490, 382203030, 542591115, 563002110, 597825570, 686106720, 742227135, 786875025, 1135145760
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OFFSET
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1,1
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MATHEMATICA
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Select[15*Range[76000000], And @@ PrimeQ /@ ({2, 4, 8, 16, 32, 64, 128, 256}*# - 1) &] (*Chandler*)
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CROSSREFS
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Cf. A006254, A124485, A124493, A124494, A124017, A125113, A124514, A124516.
Sequence in context: A105175 A069376 A066703 this_sequence A075009 A103936 A123322
Adjacent sequences: A124512 A124513 A124514 this_sequence A124516 A124517 A124518
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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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EXTENSIONS
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Extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Nov 22 2006
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