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A265691
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Irregular triangle read by rows: row n gives lexicographically first addition chain of minimal length for n.
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2
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1, 1, 2, 1, 2, 3, 1, 2, 4, 1, 2, 3, 5, 1, 2, 3, 6, 1, 2, 3, 4, 7, 1, 2, 4, 8, 1, 2, 3, 6, 9, 1, 2, 3, 5, 10, 1, 2, 3, 4, 7, 11, 1, 2, 3, 6, 12, 1, 2, 3, 5, 8, 13, 1, 2, 3, 4, 7, 14, 1, 2, 3, 5, 10, 15, 1, 2, 4, 8, 16, 1, 2, 4, 8, 9, 17, 1, 2, 3, 6, 9, 18, 1, 2, 3, 4, 8, 11, 19, 1, 2, 3, 5, 10, 20
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listen;
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OFFSET
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1,3
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COMMENTS
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The addition chains in this sequence for 1, 2, 3, 7 start respectively with 1, 1,2, 1,2,3, and 1,2,3,4. Are there minimal addition chains starting 1,2,3,4,5? 1,2,...,n for larger n?
Needs a b-file.
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LINKS
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EXAMPLE
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The table starts:
1
1 2
1 2 3
1 2 4
1 2 3 5
1 2 3 6
1 2 3 4 7
1 2 4 8
...
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CROSSREFS
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KEYWORD
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nonn,tabf,nice
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AUTHOR
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STATUS
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approved
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