1
1 has only one factor which is itself.
2 3 5 7 11 13 17 19 and 23 are prime numbers.
They having only 2 factors ( 1 and itself).
Factors for other numbers:
factors of 4: 1 , 2 , 4
factors of 6: 1 , 2 , 3 , 6
factors of 8: 1 , 2 , 4 , 8
factors of 10: 1 , 2 , 5 , 10
factors of 12: 1 , 2, 3, 4, 6, 12
factors of 14: 1 , 2 , 7 , 14
factors of 16: 1 , 2 , 4 , 8 , 16
factors of 18: 1, 2, 3, 6, 9, 18
factors of 20: 1, 2, 4, 5, 10, 20
factors of 22: 1 , 2 , 11 , 22
factors of 24: 1, 2, 3 , 4 , 6 , 8 , 12 , 24
From 1 to 25 which number has the fewest factors ?
2 answers
By the way 1 is also prime number.