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A110336
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Smallest prime of the form 2n*(2n+2)*(2n+4)*...*(2n+2k) + 1 where k is a nonnegative integer.
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1
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3, 5, 7, 13441, 11, 13, 929901772801, 17, 19, 7380172801, 23, 20530298881, 21841, 29, 31, 59535361, 7591472824321, 37, 63841, 41, 43, 32611799187695769164215700373287163408678912000001, 47
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OFFSET
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1,1
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LINKS
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Table of n, a(n) for n=1..23.
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EXAMPLE
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a(4) = 8*10*12*14 + 1 = 13441, 8 + 1, 8*10 + 1, 8*10*12 + 1 are all composite.
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MATHEMATICA
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Do[p = k = 2*n; While[ !PrimeQ[p+1], k += 2; p *= k]; Print[p+1], {n, 1, 30}] (* Ryan Propper, Aug 15 2005 *)
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CROSSREFS
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Sequence in context: A288212 A273010 A073691 * A073695 A268694 A068825
Adjacent sequences: A110333 A110334 A110335 * A110337 A110338 A110339
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KEYWORD
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nonn,more
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AUTHOR
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Amarnath Murthy, Jul 20 2005
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EXTENSIONS
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More terms from Ryan Propper, Aug 15 2005
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STATUS
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approved
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