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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
(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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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.
Adjacent sequences: A115755 A115756 A115757 this_sequence A115759 A115760 A115761
Sequence in context: A127704 A050873 A128221 this_sequence A124734 A037034 A139462
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KEYWORD
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more,nonn,tabl
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AUTHOR
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Leroy Quet (qq-quet(AT)mindspring.com), Jan 30 2006
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