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Search: id:A069900
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| A069900 |
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Integer quotient of largest and smallest prime factors of n is greater than one. |
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+0
4
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| 10, 14, 20, 21, 22, 26, 28, 30, 33, 34, 38, 39, 40, 42, 44, 46, 50, 51, 52, 55, 56, 57, 58, 60, 62, 63, 65, 66, 68, 69, 70, 74, 76, 78, 80, 82, 84, 85, 86, 87, 88, 90, 92, 93, 94, 95, 98, 99, 100, 102, 104, 105, 106, 110, 111, 112, 114, 115, 116, 117, 118, 119, 120
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Also numbers having at least one prime factor greater than twice the smallest prime factor: complement of A081306; A081303(a(n))>0. - Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Mar 17 2003
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FORMULA
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A069897(n)=Floor[P/p]>1, where P is the largest, p is the least prime-factor of n.
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EXAMPLE
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Composites with at least two and sufficiently deviating prime factors are here, like 2q, where q=prime>=5: {10,...,254}. Numbers with such divisors like 30 are also included.
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CROSSREFS
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Cf. A069897.
Sequence in context: A121893 A055985 A131693 this_sequence A073492 A073493 A031274
Adjacent sequences: A069897 A069898 A069899 this_sequence A069901 A069902 A069903
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KEYWORD
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nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), Apr 10 2002
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EXTENSIONS
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More terms from Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Mar 17 2003
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