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Number that only have themselves and 1 as
factors are said to be Prime Numbers.
For example
2  3  5  7  11  13  17  19  23  29  etc
This sequence is called a prime number sequence
1, 4, 9, 16, 25, 36, 49
This is called a square number sequence
The next sequence the difference between the numbers
increases by  1 every time  
1,     3 ,    6,     10,    15,    21,
2        3         4         5       6
This is called a triangle number sequence
1, 8, 27, 64, 125, 216
This is called a cube number sequence
12   22   32   42        52          62         72
13    23    33         43          53              63