Rectangular numbers are of the form n(n+1) for n = 1, 2, 3, 4, 5, 6, ... The first few rectangular numbers are: 2, 6, 12, 20, 30, 42, ...
6
rectangular numbers are numbers just displayed in the shape of a rectangle e.g take the number 6 it can be shown as: ** ** or ****** **
4, 6, 8, 9, 19
No. Oblong numbers are rectangular numbers with the length one longer than the width, ie they are of the form n(n+1) = n2 + n. The first few oblong numbers are 2, 6, 12, ... 8 is not one of these.
Rectangular numbers are of the form n(n+1) for n = 1, 2, 3, 4, 5, 6, ... The first few rectangular numbers are: 2, 6, 12, 20, 30, 42, ...
The second and third rectangular numbers are 6 and 12
6
rectangular numbers are numbers just displayed in the shape of a rectangle e.g take the number 6 it can be shown as: ** ** or ****** **
Rectangular numbers are a subset of composite numbers. The squares of prime numbers will be composite but not rectangular.
20 and 30 are rectangular numbers (4 * 5 and 5 * 6). There are none in between them.
a number that increases by even numbers eg 2 6
4, 6, 8, 9, 19
No. Oblong numbers are rectangular numbers with the length one longer than the width, ie they are of the form n(n+1) = n2 + n. The first few oblong numbers are 2, 6, 12, ... 8 is not one of these.
2 x 3 = 6 3 x 4 = 12 4 x 5 = 20 5 x 6 = 30 6 x 7 = 42 7 x 8 = 56 8 x 9 = 72 9 x 10 = 90 10 x 11 = 110 since rectangular numbers are of the form n(n+1) for natural numbers n > 1 That is because these form rectangles.
If you define a rectangular number as a number which is the product of two consecutive integers, none of them qualify.
6 and 8. 4 is a square, which can be considered as a special case of a rectangle.