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Search: id:A117975
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| A117975 |
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Triangle where a(1,1)=1; a(n,m) = number of positive integers which are missing from row (n-1) of the triangle, are <= n, and are coprime to m. |
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2
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| 1, 1, 0, 2, 1, 1, 2, 1, 1, 1, 3, 2, 2, 2, 2, 4, 2, 3, 2, 3, 2
(list; table; graph; listen)
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OFFSET
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1,4
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EXAMPLE
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Row 5 of the triangle is [3,2,2,2,2]. There are 4 positive integers (1,4,5,6) which are coprime to 1, are <= 6, and are not among the terms of row 5. There are 2 positive integers (1,5) which are <= 6, are coprime to 2, and are not among the terms of row 5. ...(Skipping over the m = 3, 4, and 5 cases.) There are 2 positive integer (1,5) which are <= 6, are coprime to 6, and do not occur in row 5.
So row 6 is [4,2,3,2,3,2].
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CROSSREFS
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Cf. A117974.
Sequence in context: A073204 A034003 A026835 this_sequence A143258 A027199 A140218
Adjacent sequences: A117972 A117973 A117974 this_sequence A117976 A117977 A117978
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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), Apr 06 2006
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