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A081546
Smallest prime which is 1 more than the product of n (not necessarily distinct) composite numbers.
3
2, 5, 17, 97, 257, 3457, 12289, 40961, 65537, 786433, 5308417, 14155777, 104857601, 167772161, 1811939329, 3221225473, 24159191041, 77309411329, 206158430209, 2061584302081, 2748779069441, 6597069766657, 39582418599937
OFFSET
0,1
EXAMPLE
a(0) = 1 + 1 = 2, a(3) = 4*4*6 + 1 = 97.
CROSSREFS
Cf. A081545.
Sequence in context: A059248 A203006 A143878 * A103511 A254132 A161609
KEYWORD
hard,nonn
AUTHOR
Amarnath Murthy, Apr 01 2003
EXTENSIONS
More terms from Michel ten Voorde Jun 13 2003
Added missing term 12289 and a(13)-a(22) from Donovan Johnson, Nov 05 2009
STATUS
approved