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Search: id:A143057
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| A143057 |
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A positive integer n is included if, for at least one divisor k of n and for at least one divisor j of (n+1), (k+1)*(n/k +1) = (j+1)*((n+1)/j +1). |
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+0
1
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| 5, 14, 24, 27, 44, 55, 65, 90, 98, 119, 120, 152, 153, 189, 209, 220, 230, 275, 299, 322, 324, 360, 377, 390, 434, 459, 493, 495, 551, 560, 608, 620, 629, 702, 735, 779, 782, 805, 840, 860, 874, 945, 1014, 1025, 1034, 1053, 1127, 1188, 1189, 1224, 1247, 1325
(list; graph; listen)
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OFFSET
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1,1
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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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Let n = 24. Then (k+1)*(n/k +1), when k is taken over the divisors of 24, has the values: 50, 39, 36, 35, 35, 36, 39, 50. And (j+1)*((n+1)/j +1), when j is taken over the divisors of 25, has the values: 52, 36, 52.
Since 36 occurs in both lists of products, 24 is in sequence A143057.
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CROSSREFS
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Sequence in context: A052219 A044057 A147825 this_sequence A063238 A063223 A070722
Adjacent sequences: A143054 A143055 A143056 this_sequence A143058 A143059 A143060
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KEYWORD
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nonn
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AUTHOR
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Leroy Quet Jul 20 2008
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EXTENSIONS
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Extended by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 14 2008
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