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Search: id:A081546
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| A081546 |
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Smallest prime which is 1 more than the product of n (not necessarily distinct) composite numbers. |
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+0
4
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| 2, 5, 17, 97, 257, 3457, 12289, 40961, 65537, 786433, 5308417, 14155777, 104857601, 167772161, 1811939329, 3221225473, 24159191041, 77309411329, 206158430209, 2061584302081, 2748779069441, 6597069766657, 39582418599937
(list; graph; listen)
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OFFSET
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0,1
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EXAMPLE
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a(0) = 1 + 1 = 2, a(3) = 4*4*6 + 1 = 97.
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CROSSREFS
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Cf. A081545.
Sequence in context: A026822 A059248 A143878 this_sequence A103511 A161609 A097980
Adjacent sequences: A081543 A081544 A081545 this_sequence A081547 A081548 A081549
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KEYWORD
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hard,nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Apr 01 2003
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EXTENSIONS
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More terms from Michel ten Voorde (seqfan(AT)tenvoorde.org) Jun 13 2003
Added missing term 12289 and a(13)-a(22) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Nov 05 2009
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