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Search: id:A086670
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| A086670 |
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Sum of floor(d/2) where d is a divisor of n. |
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+0
1
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| 0, 1, 1, 3, 2, 5, 3, 7, 5, 8, 5, 13, 6, 11, 10, 15, 8, 18, 9, 20, 14, 17, 11, 29, 14, 20, 18, 27, 14, 34, 15, 31, 22, 26, 22, 44, 18, 29, 26, 44, 20, 46, 21, 41, 36, 35, 23, 61, 27, 45, 34, 48, 26, 58, 34, 59, 38, 44, 29, 82, 30, 47, 49, 63, 40, 70, 33, 62, 46, 70, 35, 96, 36, 56
(list; graph; listen)
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OFFSET
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1,4
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EXAMPLE
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10 has divisors 1,2,5,10. floor(d/2) gives 0,1,2,5, therefore a(10)=8.
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PROGRAM
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(PARI) for (n=1, 100, s=0; fordiv(i=n, i, s+=floor(i/2)); print1(", "s))
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CROSSREFS
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Sequence in context: A083242 A111618 A107128 this_sequence A075888 A075889 A045766
Adjacent sequences: A086667 A086668 A086669 this_sequence A086671 A086672 A086673
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KEYWORD
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nonn
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AUTHOR
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Jon Perry (perry(AT)globalnet.co.uk), Jul 27 2003
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