The numbers for which the sum of its proper factors is 1 less than the number is the powers of 2; less than 50 these are: 2, 4, 8, 16 & 32.
100
positive square numbers less than 50 are 7 these are : 1,4,9,16,25,36,49.These are less than 50.
4,27,and38
Every prime number has exactly two factors. They are '1' and the number itself. There are 15 prime numbers less than 50. A few of them are 2, 3, 5, 7, 11, 13, and 47.
4, 9, 25 and 49 They are squares of prime numbers.
49, 25
The numbers for which the sum of its proper factors is 1 less than the number is the powers of 2; less than 50 these are: 2, 4, 8, 16 & 32.
There are 15 prime numbers less than 50
100
positive square numbers less than 50 are 7 these are : 1,4,9,16,25,36,49.These are less than 50.
4,27,and38
Every prime number has exactly two factors. They are '1' and the number itself. There are 15 prime numbers less than 50. A few of them are 2, 3, 5, 7, 11, 13, and 47.
4, 9, 25, 49
4, 9, 25 and 49 They are squares of prime numbers.
Nothing special. They are squares of prime numbers.
A number is prime if its only two factors are one and itself.