- A
triangular number or
triangle number counts objects arranged in an
equilateral triangle.
Triangular numbers are a type of
figurate number,
other examples...
-
triangular number and a
square number.
There are
infinitely many
square triangular numbers; the
first few are: 0, 1, 36, 1225, 41616, 1413721, 48024900, 1631432881...
-
properties of oblong,
triangular, and
square numbers: 1 . The
number 10 for example, can be
arranged as a
triangle (see
triangular number): But 10 cannot...
- tetrahedron. The nth
tetrahedral number, Ten, is the sum of the
first n
triangular numbers, that is, T e n = ∑ k = 1 n T k = ∑ k = 1 n k ( k + 1 ) 2 = ∑ k =...
-
different sets of
numbers,
generalizing from
triangular numbers to
different shapes (polygonal
numbers) and
different dimensions (polyhedral
numbers). The term...
- used to
approximate the
square root of two, Pell
numbers can be used to find
square triangular numbers, to
construct integer approximations to the right...
-
centered triangular numbers by
using the ****ociated figures: at each step, the
previous triangle (shown in red) is
surrounded by a
triangular layer of...
-
square numbers are a type of
figurate numbers (other
examples being cube
numbers and
triangular numbers). In the real
number system,
square numbers are non-negative...
-
points in a
pyramid with a
polygonal base and
triangular sides. The term
often refers to
square pyramidal numbers,
which have a
square base with four sides...
-
Pronic numbers 0, 2, 6, 12, 20, 30, 42, 56, 72, 90, ... a(n) = 2t(n) = n(n + 1), with n ≥ 0
where t(n) are the
triangular numbers. A002378
Markov numbers 1...
