en.wikipedia.org/wiki/Triangular_number

A triangular number or triangle number counts the objects that can form an
equilateral triangle, ... 0, 1, 3, 6, 10, 15, 21, 28, 36, 45, 55, 66, 78, 91, 105, 120,
136, 153, 171, 190, 210, 231, 253, ...

www.reference.com/math/pattern-8-5-4-9-1-7-6-3-2-0-89ffbb93a70792c6

The pattern 8 5 4 9 1 7 6 3 2 0 is an alphabetical pattern in which the numbers,
when written out in letters, are listed in alphabetical order. The solution is found ...

www.psychologytoday.com/blog/imagine/201103/what-s-the-pattern

Mar 31, 2011 ... ... first determine how the following numbers are ordered: 8 5 4 9 1 7 6 3 2. ... and
you might even recognize that the robin's call in each of these ...

riddlesbrainteasers.com/special-sequence/

What is special about the following sequence of numbers? 8 5 4 9 1 7 6 10 3 2 0.

mathbitsnotebook.com/Algebra1/Functions/FNDomainRange.html

The domain is the set of all first elements of ordered pairs (x-coordinates). ... {-3, 3
, 5, 7}. While these listings appear in ascending order, ordering is not required. ...
Yes, the relation {(3,2), (4,1), (5,9), (6,12), (7,12)}is a function. ... A discrete
domain is a set of input values that consist of only certain numbers in an int...

www.basic-mathematics.com/finding-the-median.html

S2 = {5, 3, 7, 2, 4} ... In the example above, the median is 4 because 4 is in the
middle. When the number of numbers in the set is an odd number as in the two
sets above, your median is ... S4 = { 6, 2, 8, 9, 1, 10, 4, 12} ... For example for S4,
put 1 in your new ordered list and then cross it out. ... (6 + 8)/2 is 7, so the median
i...

www.theproblemsite.com/problems/brain-food/2003/

What rare quality do these words all have in common? ... Where does 13 belong
in this ordered sequence of numbers? 8, 11, 5, 4, 9, 1, 7, 6, 10, 3, 12, 2.

www.mathpuzzle.com/1to23.txt

22 3 1 8 17 19 6 10 15 21 4 12 13 23 2 18 7 9 16 20 5 11 14 < \ 2 23 13 12 4 21
15 10 6 19 ... But four of these cells are black and only two are white. .... Solution:
1) List the 28 ordered pairs of numbers that sum to a square (4, 9, 16, 25, or 26).

www.maths.surrey.ac.uk/hosted-sites/R.Knott/runsums/

Jan 14, 2016 ... 1.1.1 / Things to do /. 2 Triangular Numbers. 2.1 Runsums and Triangular
Numbers. 3 Numbers ... Use your table to find all the runsums of 2, 3, 4, 5, 6, 7, 8,
9 and 10. There is ... In these triangles, there are 1, 3, 6 and 10 balls. How many
..... The ordered sequence of sums with two neighbouring runsums is:.

www.mathpages.com/home/kmath025.htm

Also, although it's clear that the numbers are ordered to mix the large and small ...
are much more flat than the natural monotonic sequence 1 2 3 4 5 6 7 8 9 10 11
.... Thus these are the circular arrangements of the integers 1 through 20 such ...