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Search: id:A124415
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| A124415 |
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Numbers n such that 2n+1, 4n+1, 8n+1, 16n+1, 32n+1, 64n+1 and 128n+1 are primes. |
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1
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| 8325, 82950, 884220, 1120470, 3441690, 5627895, 5765505, 7664745, 7757430, 8555040, 10739505, 11891625, 15514860, 15623475, 18268455, 22631970, 24833775, 27373410, 29342895, 31286970, 31577205, 50077455, 51541035, 58646520
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OFFSET
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1,1
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MATHEMATICA
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Select[15*Range[4000000], And @@ PrimeQ /@ ({2, 4, 8, 16, 32, 64, 128}*# + 1) &] (*Chandler*)
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CROSSREFS
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Cf. A005097, A123998, A124041, A124412-A124417.
Sequence in context: A031769 A062852 A124414 this_sequence A031947 A049357 A069402
Adjacent sequences: A124412 A124413 A124414 this_sequence A124416 A124417 A124418
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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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Corrected and extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Nov 21 2006
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