Near Matches
Ignore Exact
Everything
2
triangular number (thing)
See all of triangular number
, there are 5 more in this node.
(
thing
)
by
artemis entreri
Sun Feb 11 2001 at 6:21:42
In
combinatorics
,
integers
that can be expressed as
triangular
arrays of
dots
. Another
charcterization
is as the
binomial coefficient
C(n,4) (for n > 3 ).
An
explicit formula
for the nth
triangular number
is:
Tn = n(n+1)/2
--back to
combinatorics
--
pronic numbers
How to beat someone at "pick a number"
exercise for the reader
Pascal's Triangle
exercise, left as an
Janet Reno
polygonal number
How Gauss quickly added up the numbers 1 to 100
Combinatorics
Induction
IFF
Two color theorem
The Grand High Triangle Lover
Seven Turtles on a Log
December 26, 2006
Hexakosioihexekontahexaphobia
matrix subtraction
153
Why programmers don't comment their code
ITT
seventeen
billiards
Christmas Price Index
code golf