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Search: id:A134999
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| A134999 |
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Triangle-shaped numbers. |
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+0
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; listen)
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OFFSET
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1,1
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COMMENT
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The structure of digits represent a triangle. Three digits are the vertex. In the graphic representation the points are connected by imaginary line segments. All numbers with 3 digits are members of this sequence, except the straight-line numbers A135643. For 4 or more digits the members are 1000, 1011, 1012, 1024, 1034, 1036,...
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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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Cf. A134810, A135600, A135601, A135602, A135603, A135643.
Not to be confused with the triangular numbers, A000217!
Adjacent sequences: A134996 A134997 A134998 this_sequence A135000 A135001 A135002
Sequence in context: A112525 A000865 A135600 this_sequence A135641 A070794 A090429
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KEYWORD
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base,nonn
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AUTHOR
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Omar E. Pol (info(AT)polprimos.com), Dec 05 2007
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