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A349294
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Numbers n such that there exists a permutation p of {1,2,...,n} with p(k) dividing p(k+1) + p(k+2) for all k in {1,2,...,n-2}.
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1
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1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 34, 37, 38, 51
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graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,2
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COMMENTS
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Numbers n such that A349288(n) > 0.
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LINKS
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Table of n, a(n) for n=1..33.
Falcao, Problem of the day-13, 2021. (in Russian)
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EXAMPLE
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n=9 belongs to this sequence since permutation p = (1, 3, 8, 7, 9, 5, 4, 6, 2) satisfies the condition.
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CROSSREFS
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Cf. A349288.
Sequence in context: A004438 A109425 A226537 * A153679 A273887 A194906
Adjacent sequences: A349291 A349292 A349293 * A349295 A349296 A349297
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KEYWORD
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nonn,hard,more
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AUTHOR
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Max Alekseyev, Nov 13 2021
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STATUS
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approved
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