6
ALL of the numbers between 1 and 100 are rectangular numbers, except for 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, and 97.
14
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, ...
1 2 3 4 5
6
The prime numbers and the squares of primes between 2 and 20: 3, 4, 5, 7, 9, 11, 13, 17 and 19.
ALL of the numbers between 1 and 100 are rectangular numbers, except for 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, and 97.
If you include 2 and 11, the prime numbers are 2, 3, 5, 7, and 11.
14
The prime numbers between 2 and 11 are 3, 5 and 7 and their product: 3 x 5 x 7 = 105
The prime numbers between 10 and 15 are 11 and 13.
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 numbers that divide evenly into 30 between 1 and 11 are 1, 2, 3, 5, and 6.
12
1, 2, 3, 4, 5, 7, 11, 13, 17, 19. (I think)
5 and they are 2,3,5,7,11 2 3 5 7 11