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Search: id:A143176
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| A143176 |
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a(1)=1. a(n) is the smallest positive multiple of n that has more divisors than a(n-1) has. |
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+0
6
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| 1, 2, 6, 12, 30, 36, 84, 120, 180, 240, 660, 720, 1560, 1260, 1680, 2880, 6120, 5040, 15960, 10080, 15120, 27720, 115920, 83160, 138600, 196560, 302400, 277200, 803880, 498960, 1562400, 665280, 720720, 1413720, 1441440, 2162160, 8205120
(list; graph; listen)
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OFFSET
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1,2
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LINKS
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Leroy Quet, Home Page (listed in lieu of email address)
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EXAMPLE
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a(4)=12 has 6 divisors. Checking the multiples of 5: 1*5=5 has 2 divisors. 2*5=10 has 4 divisors. 3*5=15 has 4 divisors. 4*5=20 has 6 divisors. 5*5=25 has 3 divisors. So the first 5 positive multiples of 5 each have <= 6 divisors. But 6*5 = 30 has 8 divisors. And since 8 > 6, a(5) = 30.
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CROSSREFS
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Cf. A143177, A143178.
Sequence in context: A057582 A094779 A093387 this_sequence A081375 A024701 A038199
Adjacent sequences: A143173 A143174 A143175 this_sequence A143177 A143178 A143179
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KEYWORD
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nonn
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AUTHOR
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Leroy Quet Jul 28 2008
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EXTENSIONS
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a(9)-a(37) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Sep 05 2008
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