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Search: id:A115758
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| A115758 |
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Triangle where a(1,1)=0. a(n,m) = number of terms among first (n-1) terms of sequence A115759 which are coprime to m. A115759(n) is the sum of terms in the n-th row of triangle A115758. |
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+0
4
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| 0, 1, 0, 2, 1, 1, 3, 1, 2, 1, 4, 2, 3, 2, 3, 5, 2, 4, 2, 4, 2, 6, 3, 5, 3, 5, 3, 3, 7, 3, 6, 3, 6, 3, 3, 3, 8, 3, 7, 3, 7, 3, 4, 3, 7, 9, 4, 7, 4, 7, 3, 5, 4, 7, 3, 10, 5, 8, 5, 8, 4, 6, 5, 8, 4, 9, 11, 5, 8, 5, 9, 4, 7, 5, 8, 4, 10, 4, 12, 5, 9, 5, 9, 4, 8, 5, 9, 4, 11, 4, 11, 13, 5, 9, 5, 10, 4, 9, 5, 9, 4
(list; table; graph; listen)
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OFFSET
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1,4
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COMMENT
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0 is considered here to be coprime only to 1.
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LINKS
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Diana Mecum, Table of n, a(n) for n = 1..5151 [From Diana Mecum (diana.mecum(AT)gmail.com), Aug 11 2008]
Leroy Quet, Home Page (listed in lieu of email address)
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EXAMPLE
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The first 4 terms of sequence A115759 are 0, 1, 4 and 7.
Among these there are 4 terms coprime to 1, 2 terms coprime to 2, 3 terms coprime to 3, 2 terms coprime to 4 and 3 terms coprime to 5.
So row 5 of the triangle is [4,2,3,2,3].
(And so A115759(5) = 4+2+3+2+3 = 14.)
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CROSSREFS
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Cf. A115756, A115759.
Sequence in context: A127704 A050873 A128221 this_sequence A124734 A037034 A139462
Adjacent sequences: A115755 A115756 A115757 this_sequence A115759 A115760 A115761
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KEYWORD
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nonn,tabl
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AUTHOR
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Leroy Quet, Jan 30 2006
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EXTENSIONS
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Terms a(22) through a(5151) from Diana Mecum (diana.mecum(AT)gmail.com), Aug 11 2008
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