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Search: id:A115756
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| A115756 |
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Triangle where a(1,1)=1. a(n,m) = number of terms among first (n-1) terms of sequence A115757 which are coprime to m. A115757(n) is the sum of terms in the n-th row of triangle A115756. |
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+0
3
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| 1, 1, 1, 2, 1, 2, 3, 2, 3, 2, 4, 2, 4, 2, 2, 5, 2, 5, 2, 3, 2, 6, 3, 6, 3, 4, 3, 5, 7, 3, 6, 3, 4, 3, 6, 3, 8, 4, 7, 4, 4, 4, 6, 4, 7, 9, 4, 7, 4, 5, 4, 7, 4, 7, 2, 10, 5, 8, 5, 6, 5, 8, 5, 8, 3, 10, 11, 6, 9, 6, 7, 6, 9, 6, 9, 4, 11, 6, 12, 6, 9, 6, 7, 6, 10, 6, 9, 4, 12, 6, 12, 13, 7, 9, 7, 7, 6
(list; table; graph; listen)
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OFFSET
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1,4
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LINKS
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Diana Mecum, Table of n, a(n) for n = 1..2850 [From Diana Mecum (diana.mecum(AT)gmail.com), Aug 09 2008]
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EXAMPLE
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The first 4 terms of sequence A115757 are 1, 2, 5, and 10.
Among these there are 4 terms coprime to 1, 2 terms coprime to 2, 4 terms coprime to 3, 2 terms coprime to 4, and 2 terms coprime to 5.
So row 5 of the triangle is [4,2,4,2,2].
(And so A115757(5) = 4+2+4+2+2 = 14.)
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CROSSREFS
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Cf. A115757, A115758.
Sequence in context: A086520 A012265 A006641 this_sequence A067731 A130634 A053735
Adjacent sequences: A115753 A115754 A115755 this_sequence A115757 A115758 A115759
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KEYWORD
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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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EXTENSIONS
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Terms 22 through 2850 from Diana Mecum (diana.mecum(AT)gmail.com), Aug 09 2008
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