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Search: id:A115862
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| A115862 |
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Triangle where a(1,1)=0; a(n,m) is number of terms among the first (n-1) terms of A115863 that are not coprime to m. A115863(n) is the sum of the terms of the n-th row of A115862. |
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+0
2
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| 0, 0, 1, 0, 1, 1, 0, 2, 1, 2, 0, 2, 1, 2, 2, 0, 2, 1, 2, 2, 2, 0, 2, 2, 2, 2, 3, 2, 0, 2, 2, 2, 2, 3, 2, 2, 0, 2, 3, 2, 3, 4, 2, 2, 3, 0, 2, 4, 2, 3, 5, 3, 2, 4, 4
(list; table; graph; listen)
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OFFSET
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1,8
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COMMENT
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If a(1,1) was instead 1, then row 2 would be [0,0], and the rest of the triangle would be the same as when a(1,1) = 0. For our purposes, 0 is considered to be coprime only with 1.
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EXAMPLE
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The first 5 terms of A115863 are 0,1,2,5, and 7. Among these terms 0 are not coprime with 1, 2 are not coprime with 2, 1 is not coprime with 3, 2 are not coprime with 4, 2 are not coprime with 5, and 2 are not coprime with 6.
So row 6 of the triangle is [0,2,1,2,2,2].
(And so A115863(6) = 0+2+1+2+2+2 = 9.)
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CROSSREFS
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Cf. A115863, A115758.
Sequence in context: A071460 A033794 A101665 this_sequence A029357 A118054 A077883
Adjacent sequences: A115859 A115860 A115861 this_sequence A115863 A115864 A115865
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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), Feb 01 2006
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