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Search: id:A069553
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| A069553 |
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Define S(k) to be the sequence of divisors and multiples of k, e.g. S(1) = 1,2,3,4,5... S(2) = 1,2,4,6,8,10,... S(10) = 1,2,5,10,20,30,40,50,...; a(n) = n-th term of the n-th sequence S(n). |
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1
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| 1, 2, 6, 8, 20, 18, 42, 40, 63, 70, 110, 84, 156, 154, 180, 192, 272, 234, 342, 300, 378, 418, 506, 408, 575, 598, 648, 644, 812, 690, 930, 864, 990, 1054, 1120, 1008, 1332, 1330, 1404, 1320, 1640, 1470, 1806, 1716, 1800, 1978, 2162, 1872, 2303, 2250, 2448
(list; graph; listen)
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OFFSET
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1,2
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FORMULA
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a(n) = n*{n - d(n) + 1} where d(n) = number of divisors of n.
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CROSSREFS
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Sequence in context: A124827 A140965 A002618 this_sequence A143481 A093968 A064713
Adjacent sequences: A069550 A069551 A069552 this_sequence A069554 A069555 A069556
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KEYWORD
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nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Mar 22 2002
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EXTENSIONS
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Corrected and extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Sep 29 2003
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