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Search: id:A061194
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| A061194 |
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Minimum positive value of LCM{1,...,n}*(s_1/1 + ... + s_n/n), where each s_i equals 1 or -1. |
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+0
2
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| 1, 1, 1, 1, 7, 3, 11, 13, 11, 11, 23, 23, 607, 251, 251, 125, 97, 97, 3767, 3767, 3767, 2285
(list; graph; listen)
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OFFSET
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1,5
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COMMENT
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Nonnegative by considering the largest power of 2 up to n
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EXAMPLE
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1/1 - 1/2 - 1/3 - 1/4 - 1/5 + 1/6 + 1/7 = 11/420 = 11/LCM[1,2,3,4,5,6,7], so a(7)<=11; no other choice of signs yields 1/420, ..., 10/420, so a(7)=11.
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CROSSREFS
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See also A061195.
Sequence in context: A084000 A138859 A076569 this_sequence A145399 A160797 A050013
Adjacent sequences: A061191 A061192 A061193 this_sequence A061195 A061196 A061197
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KEYWORD
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nonn
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AUTHOR
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Greg Martin (gerg(AT)math.toronto.edu), Apr 19 2001
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EXTENSIONS
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More terms from Naohiro Nomoto (6284968128(AT)geocities.co.jp), Jun 24 2001
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