- in 3 ways: it is the 5th
triangular number, a
hexagonal number, and
pentadecagonal number. a
centered tetrahedral number. the
number of
partitions of 7...
- In geometry, a
prism is a
polyhedron comprising an n-sided
polygon base, a
second base
which is a
translated copy (rigidly
moved without rotation) of the...
-
Although the vast
majority of
coins are round,
coins are made in a
variety of
other shapes,
including squares, diamonds, hexagons, heptagons, octagons...
-
numerous topologically distinct forms of a hexadecahedron, for
example the
pentadecagonal pyramid,
tetradecagonal prism and
heptagonal antiprism.
There are 387...
- 186 259 344 441 550 2/5 ln 2 + 3/10 ln 3 + π√3/10 A051866 15
Pentadecagonal 1/2(13n2 − 11n) 1 15 42 82 135 201 280 372 477 595 A051867 16 Hexadecagonal...
- 8\cdot 9+10\cdot 11\cdot 12} ,
largest number not the sum of
distinct pentadecagonal numbers 1951 =
cuban prime 1952 =
number of
covers of {1, 2, 3, 4} 1953...
-
forms of a heptadecahedron, for
example the
hexadecagonal pyramid and
pentadecagonal prism.
There are 6,415,851,530,241
topologically distinct convex heptadecahedra...
-
gyrobicupola Disphenocingulum Snub
square antiprism 17
Hexadecagonal pyramid Pentadecagonal bipyramid 18
Nonagonal prism Enneagonal antiprism Gyroelongated triangular...
