View Full Version : What is this math term?
05-17-2005, 09:05 PM
I know that "factorial" means the product of all the positive integers from 1 to a given number.
What is the term for the sum of those numbers?
05-17-2005, 09:14 PM
The triangular numbers.
05-17-2005, 09:15 PM
(From MathWorld) (http://mathworld.wolfram.com/TriangularNumber.html)
05-17-2005, 10:51 PM
Or just "the summation of all integers from 1 to n"
05-17-2005, 11:24 PM
There is no standard term for the operation. The triangular numbers are the sequence of sums, but you can't use it like "n triangle".
05-18-2005, 01:02 AM
Because you can just say n(n+1)/2, I doubt there's ever been a need for another name. (As ultrafilter said, "triangular numbers" refers to the sequence, rather than the operation.)
vBulletin® v3.7.3, Copyright ©2000-2013, Jelsoft Enterprises Ltd.