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A096221
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a(n) is the number of distances used by minimal prime-complete rulers for the first n primes.
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1
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OFFSET
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0,2
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COMMENTS
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The best known upper bounds for a(9-15) are 22, 25, 29, 33, 37, 41, 45. See attached file for the corresponding rulers. - Dmitry Kamenetsky, Mar 09 2018
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LINKS
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EXAMPLE
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a(7)=15: there are 7 primes (2, 3, 5, 7, 11, 13, 17) and 8 ones. These rulers can generate every distance between 1 and 66, inclusive. There are two such rulers: 1.1.1.1.11.1.1.2.13.7.17.1.3.5.1 and 1.1.1.1.11.2.1.1.13.7.17.1.5.3.1
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CROSSREFS
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KEYWORD
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nonn,more
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AUTHOR
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STATUS
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approved
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