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20 and 30 are rectangular numbers (4 * 5 and 5 * 6). There are none in between them.
The only square number between 20 and 30 is 25.
10, 20, 30, 40, 50...
It is: 20
20 5 30 6 42 7 Every other number is the product (multiplied) of the numbers it is between(5x6=30, 6x7=42), and the numbers between go in order (5, 6, 7) Therefor the next #s would be 56 8 72 9 90 10