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Search: id:A081536
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| A081536 |
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Let f(n) be smallest number k which is a sum of n distinct numbers whose LCM is a multiple of k. Sequence gives triangle read by rows in which n-th row consists of those n numbers (row 2 is 0, 0 by convention). |
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+0
4
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| 1, 0, 0, 1, 2, 3, 3, 4, 5, 8, 1, 2, 3, 4, 5
(list; table; graph; listen)
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OFFSET
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1,5
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FORMULA
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a(n) = sigma(A005179(n)).
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EXAMPLE
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1; 0,0; 1,2,3; 3,4,5,8; 1,2,3,4,5; ...
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CROSSREFS
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Cf. A081535, A081537, A081538.
Sequence in context: A094979 A065565 A017842 this_sequence A023154 A070820 A031501
Adjacent sequences: A081533 A081534 A081535 this_sequence A081537 A081538 A081539
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KEYWORD
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tabl,more,nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Mar 28 2003
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