| 1, 1, 1, 2, 1, 1, 1, 2, 1, 7, 3, 1, 1, 3, 1, 3, 1, 1, 12, 3, 1, 1, 1, 4, 1, 6, 1, 1, 1, 22, 7, 1, 3, 1, 1, 1, 1, 15, 3, 1, 1, 1, 1, 14, 3, 1, 1, 1, 1, 1, 3, 1, 1, 3, 1, 1, 1, 2, 1, 13, 3, 1, 1, 1, 3, 1, 2, 1, 1, 1, 1, 7, 3, 10, 4, 2, 3, 1, 1, 7, 3, 26, 10, 10, 2, 1, 3, 1, 1, 1, 26, 10, 26, 2, 4, 8, 3, 1, 1, 1
(list; graph; listen)
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OFFSET
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1,4
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COMMENT
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For nomenclature related to perfect and optimal rulers see Peter Luschny's "Perfect Rulers" web pages.
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LINKS
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Peter Luschny, Perfect and Optimal Rulers. A short introduction.
Hugo Pfoertner, Largest and smallest maximum differences of consecutive marks of perfect rulers.
Index entries for sequences related to perfect rulers.
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EXAMPLE
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a(11)=3 because 3 of the A103300(11)/2=15 perfect rulers of length 11 can be constructed using the shortest possible maximum segment length A104307(11)=3: [0,1,2,5,8,11], [0,1,4,6,9,11], [0,1,4,7,9,11], not counting their mirror images.
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CROSSREFS
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Cf. A104307 size of minimally required longest segment, A103294 definitions related to complete rulers.
Sequence in context: A009191 A114717 A080388 this_sequence A122377 A037827 A086074
Adjacent sequences: A104305 A104306 A104307 this_sequence A104309 A104310 A104311
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KEYWORD
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nonn
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AUTHOR
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Hugo Pfoertner (hugo(AT)pfoertner.org), Mar 01 2005
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