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Search: id:A138045
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| A138045 |
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Triangle read by rows: largest proper divisor of n as a table, ones excluded. |
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+0
1
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| 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 0, 0, 0, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 5, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 6, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 7, 0, 0, 0, 0, 0, 0, 0
(list; table; graph; listen)
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OFFSET
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1,8
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COMMENT
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The numbers in the triangle form lines that begin at T(A001248,A000040). The first line of numbers from the right, is T(A005843,A000027). The second line is T(A016945,A005408). The third line is T(A084967,A007310).
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LINKS
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Weisstein, Eric W., Proper Divisor.
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FORMULA
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T(n,k) = if k==A032742(n) and n(T(n,k))==n(A032742(n)) and k>1 then k else 0 (1<=k<=n), T(1,1)=0.
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EXAMPLE
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The first few terms of the table are:
0
0,0
0,0,0
0,2,0,0
0,0,0,0,0
0,0,3,0,0,0
0,0,0,0,0,0,0
0,0,0,4,0,0,0,0
0,0,3,0,0,0,0,0,0
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CROSSREFS
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Cf. A001248, A016945, A084967, A007310, A127093, A032742, A007775.
Sequence in context: A083910 A069843 A069849 this_sequence A004530 A084863 A073346
Adjacent sequences: A138042 A138043 A138044 this_sequence A138046 A138047 A138048
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KEYWORD
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nonn,tabl
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AUTHOR
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Mats Granvik (mgranvik(AT)abo.fi), Mar 02 2008
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