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A119868
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Number of different values assumed by a/b+c/d as a,b,c,d range between 1 and n.
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1
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1, 6, 21, 44, 124, 158, 382, 558, 899, 1087, 2022, 2328, 3936, 4542, 5463, 6755, 10366, 11306, 16488, 18315, 21092, 23455, 32562, 34901
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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EXAMPLE
| a(2)=6 since we can obtain 6 values, i.e., {1, 3/2, 2, 5/2, 3, 4}.
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MATHEMATICA
| Table[Length@Union@Flatten@Table[a/b + c/d, {a, n}, {b, n}, {c, n}, {d, n}], {n, 24}]
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CROSSREFS
| Cf. A119867.
Sequence in context: A056237 A199194 A048036 * A175729 A081266 A087863
Adjacent sequences: A119865 A119866 A119867 * A119869 A119870 A119871
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KEYWORD
| nonn
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AUTHOR
| Giovanni Resta (g.resta(AT)iit.cnr.it), May 26 2006
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