The first composite number is 4.
The two perfect numbers between 1 and 30 are: 6, 28
The even numbers between 1 and 30 are:2,4,6,8,10,12,14,16,18,20,22,24,26, and 28.
The sum of all prime numbers between 1 and 11 is 28.
6 and 28
1, 6 , 8 , 23, 28
They are: 1, 4, 9, 16 and 25
The triangular numbers between 1 and 66 are: 3, 6, 10, 15, 21, 28, 36, 45 and 55.
No, there are no known perfect numbers between 1 and 30. The only perfect numbers that have been discovered are 6, 28, 496, and 8128.
The GCF of these numbers is 1. They have no factors higher than 1 between them.
The triangular numbers between 1 and 100 are: 1, 3, 6, 10, 15, 21, 28, 36, 45, 55, 66, 78, 91.
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The sum of all the odd numbers between 1 and 30 (2-28) is 784. If you include 30 the result is 900.