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Search: id:A084714
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| A084714 |
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a(n) = smallest prime of the form (2n-1)^k - 2, or 0 if no such number exists. |
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+0
12
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| 0, 7, 3, 5, 7, 14639, 11, 13, 24137567, 17, 19, 480250763996501976790165756943039, 23, 727, 839, 29, 31, 1223, 1367, 37, 2825759, 41, 43, 2207, 47, 45767944570399, 7890479, 53, 1176246293903439667999, 12117359, 59, 61, 318644812890623
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OFFSET
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1,2
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MATHEMATICA
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f[n_] := Block[{k = 1}, While[ !PrimeQ[(2*n - 1)^k - 2], k++ ]; (2*n - 1)^k - 2]; Table[ f[n], {n, 2, 34}]
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CROSSREFS
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Cf. A084712, A084713.
Sequence in context: A021140 A119714 A135002 this_sequence A030760 A021580 A091682
Adjacent sequences: A084711 A084712 A084713 this_sequence A084715 A084716 A084717
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KEYWORD
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nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Jun 10 2003
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EXTENSIONS
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Edited, corrected and extended by Robert G. Wilson v (rgwv(AT)rgwv.com), Jun 11, 2003
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