So far I know that 120 is a rectangular number
Rectangular numbers are a subset of composite numbers. The squares of prime numbers will be composite but not rectangular.
The second and third rectangular numbers are 6 and 12
There is no such formula. Rectangular numbers are composite numbers and there is no known formula that will generate either composite numbers or prime numbers.
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 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, ...
42
A row of numbers, a column of numbers or a rectangular layout of numbers.
101
Apart fro the fact that no number is triangler, none of the numbers listed are rectangular and triangular.
They are simply rectangular arrays of numbers.
6
12