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A118771
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Let a "sum" be a set {x,y,z} of distinct natural numbers such that x+y=z and let N_m={1,2,...m}. a(n) is the smallest s such that there is no partition of N_s into n sum-free parts.
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0
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OFFSET
| 1,1
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REFERENCES
| P. Blanchard, F. Harary and R. Reis, Partitions into sum-free sets, Integers: electronic journal of combinatorial number theory, 6. 2006.
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EXAMPLE
| For n=1, a(1)=3 as there is no partition of N_3={1,2,3} into 1-sum-free parts. In the same way a(2)=9...
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CROSSREFS
| Sequence in context: A051042 A121907 A179176 * A091587 A018047 A090577
Adjacent sequences: A118768 A118769 A118770 * A118772 A118773 A118774
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KEYWORD
| nonn
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AUTHOR
| R. Reis (rvr(AT)ncc.up.pt), May 22 2006
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