16prime + prime = (sum) sum is 16or13 + 3 =16
No, it is not.Incidentally, is a number p is prime then its 2 factors are 1 and p. Their sum is p+1.If p is a perfect number then this sum must be 2p.That is, p+1 = 2p or p = 1.But 1 is not a prime. So no prime can be a perfect number and since 13 is prime, it cannot be a perfect number.
The following numbers less than 50 have 2 prime factors. Some are squares, having two of the same prime factor. Some have two different prime factors. The prime factors of 4 are 2 and 2. The prime factors of 6 are 2 and 3. The prime factors of 9 are 3 and 3. The prime factors of 10 are 2 and 5. The prime factors of 14 are 2 and 7. The prime factors of 15 are 3 and 5. The prime factors of 21 are 3 and 7. The prime factors of 22 are 2 and 11. The prime factors of 25 are 5 and 5. The prime factors of 26 are 2 and 13. The prime factors of 33 are 3 and 11. The prime factors of 34 are 2 and 17. The prime factors of 35 are 5 and 7. The prime factors of 38 are 2 and 19. The prime factors of 39 are 3 and 13. The prime factors of 46 are 2 and 23. The prime factors of 49 are 7 and 7.
The sum is 121.
The prime factors of 18 are 2, 3, and 3. The prime factors of 90 are 2, 3, 3, and 5. The prime factors they have in common are 2, 3, and 3. Since 18 is a factor of 90, its prime factors will be the prime factors that the two numbers have in common.
the prime factors of sum of 121 is 112 and 22
The prime factors of 28 are 2 and 7. Their sum is 9.
The factors of 91 are: 1 7 13 91.The prime factors are: 7 x 13The sum of the prime factors = 7 + 13 = 20
217
Factors for 20 are: 1, 2, 4, 5, 10, 20 Prime Factors: 2, 5 sum of prime factors = 2 + 5 = 7
sum of prime factors of 245 = 12factors of 245: 1, 5, 7, 35, 49, 245.prime factors of 245: 5 & 7sum of prime factors of 245: 5 + 7 = 12
The prime factors of 36 are 2 and 3. Add them together.
The prime factors are: 2 and 5 (2+5 = 7)
13
No.
The prime factors of 50 are: 2 and 5. 2+5 = 7
The prime factors of 14 are 2 and 7. 2 + 7 = 9.