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Search: id:A124416
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| A124416 |
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Numbers n such that 2n+1, 4n+1, 8n+1, 16n+1, 32n+1, 64n+1, 128n+1 and 256n+1 are primes. |
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2
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| 7757430, 31286970, 360821505, 365536215, 414779430, 418803000, 428547690, 428823900, 434768475, 508654155, 584808795, 732681630, 809814510, 846079035, 857095380, 968314215, 1115279880, 1187901285, 1193371860, 1244805450
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OFFSET
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1,1
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MATHEMATICA
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Select[15*Range[10^8], And @@ PrimeQ /@ ({2, 4, 8, 16, 32, 64, 128, 256}*# + 1) &] (*Chandler*)
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CROSSREFS
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Cf. A005097, A123998, A124041, A124412-A124417.
Sequence in context: A102334 A043668 A080340 this_sequence A032430 A015391 A059693
Adjacent sequences: A124413 A124414 A124415 this_sequence A124417 A124418 A124419
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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 02 2006
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EXTENSIONS
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Extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Nov 21 2006
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