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Rectangular numbers are numbers that can be represented as a rectangle with a whole number of rows and columns. In this case, the rectangular numbers between 11 and 17 are 12 and 16. The number 12 can be represented as a 3x4 rectangle, and the number 16 can be represented as a 4x4 square.
The prime numbers and the squares of primes between 2 and 20: 3, 4, 5, 7, 9, 11, 13, 17 and 19.
11 13 17
The prime numbers between 10 and 20 are 11, 13, 17, and 19.
The prime numbers from 1 to 17 are 2, 3, 5, 7, 11, 13, and 17.