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Search: id:A139091
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| A139091 |
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a(n) = largest prime divisor of the number prime(n)!/9 + 1. |
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+0
4
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| 17, 827, 22319071, 1718296754087, 35662591735219, 477262171871, 1609727002420791262479701, 146215297537890243023, 2020914387433686758547638152441, 1073774770807266077323
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OFFSET
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4,1
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MATHEMATICA
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a = {}; Do[w = FactorInteger[(Prime[n]! + 9)/9]; AppendTo[a, Last[w][[1]]], {n, 4, 16}]; a
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CROSSREFS
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Cf. A082672, A089085, A089130, A117141, A007749, A139056, A139057, A139058, A139059, A139060, A139061, A139061, A139062, A139063, A139064, A139065, A139066, A020458, A139068, A137390, A139070, A139071, A139072, A139073, A139074, A139074, A139075, A136019, A136020, A136026, A136027, A139089, A139090, A139091, A139092.
Sequence in context: A012085 A012221 A012144 this_sequence A124235 A086265 A156138
Adjacent sequences: A139088 A139089 A139090 this_sequence A139092 A139093 A139094
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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), Apr 08 2008
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