It is the square root of (-4-11)2+(17-17)2 which works out as 15.
28
16 = 42
11+13+17+19= 60ANSWER: 60
1, 2, 3, 4, 5, 7, 11, 13, 17, 19. (I think)
12
42
6
The prime numbers and the squares of primes between 2 and 20: 3, 4, 5, 7, 9, 11, 13, 17 and 19.
57
11 13 17
4, 6, 8, 9, 19
It is the square root of (-4-11)2+(17-17)2 which works out as 15.
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.
17 x 11 x 6 = 1122 cubic cm
11, 13, 17, 19
11 13 15 17 19