-
pyramidal number is the
number of
points in a
pyramid with a
polygonal base and
triangular sides. The term
often refers to
square pyramidal numbers,...
- In mathematics, a
pyramid number, or
square pyramidal number, is a
natural number that
counts the
stacked spheres in a
pyramid with a
square base. The...
- A
tetrahedral number, or
triangular pyramidal number, is a
figurate number that
represents a
pyramid with a
triangular base and
three sides,
called a tetrahedron...
-
pyramid of
numbers representing the
number of
individual organisms at each
trophic level.
Pyramids of
energy are
normally upright, but
other pyramids...
-
truncated triangular pyramid number is
found by
removing (truncating) some
smaller tetrahedral number (or
triangular pyramidal number) from each of the...
- +N^{2}={\frac {N(N+1)(2N+1)}{6}}.} The
first values of
these sums, the
square pyramidal numbers, are: (sequence A000330 in the OEIS) 0, 1, 5, 14, 30, 55, 91, 140...
-
member of the
subset of the sets
above containing only
triangular numbers,
pyramidal numbers, and
their analogs in
other dimensions. Some
kinds of figurate...
-
viewed as
figurate numbers, a four-dimensional
hyperpyramidal generalization of the
triangular numbers and
square pyramidal numbers. As
Stein (1971) observes...
- as a sum of two
abundant numbers 20230 =
pentagonal pyramidal number 20412 =
Leyland number: 93 + 39 20540 =
square pyramidal number 20569 = tetranacci...
- OEIS Foundation. Sloane, N. J. A. (ed.). "Sequence A000330 (Square
pyramidal numbers: a(n) = 0^2 + 1^2 + 2^2 + ... + n^2 = n*(n+1)*(2*n+1)/6.)". The On-Line...
