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A134999
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Triangle-shaped numbers.
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2
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100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 148, 149, 150, 151
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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COMMENTS
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The structure of digits represents a triangle. Three digits are the vertex. In the graphic representation the points are connected by imaginary line segments. All 3-digit numbers are terms of this sequence, except for the straight-line numbers A135643. For 4 or more digits the terms are 1000, 1011, 1012, 1024, 1034, 1036, ...
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LINKS
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EXAMPLE
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The triangle number 1024:
. . . 4
. . . .
. . 2 .
1 . . .
. 0 . .
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CROSSREFS
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Not to be confused with the triangular numbers, A000217!
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KEYWORD
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base,nonn
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AUTHOR
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STATUS
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approved
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