They are the numbers that have more than two factors
All of them except for 61 and 67 which are prime numbers
They are all: -positive numbers -composite numbers (have more than 2 factors) -integers
60 and 80 :D
It is: 12+14+15+16+18 = 75
60, 72, 84, 90 and 96 all have 12 factors.
2
60 is an even composite number. It ends with 0, making it an even number, and all even numbers over 2 are composite numbers.
All even numbers greater than 2 are composite.
All of them except for 61 and 67 which are prime numbers
All of them except for 47, 53 and 59 which are prime numbers
They are all: -positive numbers -composite numbers (have more than 2 factors) -integers
Between 60 and 70 the composite numbers are: 62, 63, 64, 65, 66, 68, 69. 60 and 70 are also composite.
60 and 30
60 and 80 :D
60, 62, 63, 64, 65, 66, 68, 69, 70
23 and 31 are prime numbers whereas 52 33 60 and 25 are composite numbers.
It is: 12+14+15+16+18 = 75