57
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4, 6, 8, 9, 19
All numbers between -11 and 1, excluding -11 and including 1.
221
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.
6
12
4, 6, 8, 9, 19
42
The prime numbers and the squares of primes between 2 and 20: 3, 4, 5, 7, 9, 11, 13, 17 and 19.
All numbers between -11 and 1, excluding -11 and including 1.
221
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.
The two numbers which add to 5 and their difference is 11 are:-3 + (-8) = 5
10. It is what you get when you add the two numbers together and divide by two and it is the number that is halfway between the two numbers.
12, 16 and 23 is one possible triplet.
-11