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A077139
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a(1) = 1, a(n) = lcm(n, a(n-1)) / gcd(n, a(n-1)).
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0
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1, 2, 6, 6, 30, 5, 35, 280, 2520, 252, 2772, 231, 3003, 858, 1430, 5720, 97240, 437580, 8314020, 415701, 969969, 176358, 4056234, 2704156, 67603900, 2600150, 70204050, 10029150, 290845350, 9694845, 300540195, 9617286240, 35263382880, 1037158320
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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EXAMPLE
| a(5) = 30 because given a(4) = 6: lcm(5, 6) / gcd(5, 6) = 30 / 1 = 30.
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MATHEMATICA
| k = 1; Print[k]; Do[k = LCM[n, k] / GCD[n, k]; Print[k], {n, 2, 30}] (Propper)
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CROSSREFS
| Essentially a duplicate of A008339, which is the main entry for this sequence.
Sequence in context: A072983 A055204 A008339 * A068629 A144361 A163641
Adjacent sequences: A077136 A077137 A077138 * A077140 A077141 A077142
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KEYWORD
| nonn
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Oct 30 2002
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EXTENSIONS
| Corrected and extended by Ryan Propper (rpropper(AT)stanford.edu), Jun 19 2005
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