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Search: id:A139092
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| A139092 |
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a(n) = number of (distinct) prime divisors of (9+prime(n)!)/9. |
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+0
4
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| 3, 3, 2, 2, 2, 3, 2, 3, 4, 4, 5, 3, 3, 6, 5, 2, 3
(list; graph; listen)
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OFFSET
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4,1
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COMMENT
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Conjecture: all prime divisors in A139089 are distinct
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MATHEMATICA
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a = {}; Do[w = (Prime[n]! + 9)/9; AppendTo[a, w], {n, 4, 16}]; a (*Artur Jasinski*)
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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: A133884 A065775 A096837 this_sequence A021305 A075788 A162235
Adjacent sequences: A139089 A139090 A139091 this_sequence A139093 A139094 A139095
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KEYWORD
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more,nonn
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AUTHOR
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Artur Jasinski (grafix(AT)csl.pl), Apr 08 2008
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