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Search: id:A129125
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| A129125 |
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Prune the tree structure defined in sequence A129129 yielding a new irregular table with shape sequence A027336. |
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+0
1
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| 1, 2, 3, 5, 6, 7, 10, 9, 11, 14, 15, 18, 13, 22, 21, 25, 30, 27, 17, 26, 33, 35, 42, 50, 45, 54, 19, 34, 39, 55, 66, 49, 70, 63, 75, 90, 81
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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A000041 begins 1 1 2 3 5 7 11 15 22 30 42 ... and when shifted 0 0 1 1 2 3 5 7 11 15 22 ... by subtraction yielding 1 1 1 2 3 4 6 8 11 15 20 ... shape seq A027736.
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EXAMPLE
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The original tree begins
1
2
3 4
5 6 8
7 10 9 12 16
11 14 15 20 18 24 32
multiplying by four yields
4
8
12 16
20 24 32
etc.
These are the values to be omitted leaving
1
2
3
5 6
7 10 9
11 14 15 18
etc.
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CROSSREFS
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Cf. A000041 A027336 A129129.
Sequence in context: A100693 A030159 A030161 this_sequence A071591 A028769 A094784
Adjacent sequences: A129122 A129123 A129124 this_sequence A129126 A129127 A129128
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KEYWORD
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easy,more,nonn,tabf
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AUTHOR
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Alford Arnold (Alford1940(AT)aol.com), Apr 04 2007
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