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A109497
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Number of lucky numbers <= n.
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7
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1, 1, 2, 2, 2, 2, 3, 3, 4, 4, 4, 4, 5, 5, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 9, 9, 10, 10, 10, 10, 11, 11, 11, 11, 11, 11, 12, 12, 12, 12, 12, 12, 13, 13, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 15, 15, 15, 15, 16, 16, 17, 17, 17, 17, 18, 18, 19, 19, 19, 19, 20, 20
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,3
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REFERENCES
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R. K. Guy, Unsolved Problems in Number Theory, C3.
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LINKS
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EXAMPLE
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a(9)=4 because there are 4 lucky numbers less than or equal to 9 (1, 3, 7, 9)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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Shawn M. Moore (sartak(AT)gmail.com), Jun 30 2005
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STATUS
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approved
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