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A134999 Triangle-shaped numbers. 2
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)
OFFSET

1,1

COMMENTS

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,...

LINKS

Table of n, a(n) for n=1..48.

EXAMPLE

The triangle number 1024.

. . . 4

. . . .

. . 2 .

1 . . .

. 0 . .

CROSSREFS

Cf. A134810, A135600, A135601, A135602, A135603, A135643.

Not to be confused with the triangular numbers, A000217!

Sequence in context: A112525 A000865 A135600 * A301516 A204581 A135641

Adjacent sequences:  A134996 A134997 A134998 * A135000 A135001 A135002

KEYWORD

base,nonn

AUTHOR

Omar E. Pol, Dec 05 2007

STATUS

approved

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Last modified March 25 12:11 EDT 2019. Contains 321470 sequences. (Running on oeis4.)