19 + 5 + 2
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It is simply: 3+23 = 26 because 3 and 23 are prime numbers
Prime numbers are integers. They won't equal a decimal.
The prime numbers (factors) of 405 are: 3 and 5
55 does not have 3 prime factors.
YES. There are 9 prime numbers from 1 to 25. There are only 6 prime numbers from 26 to 50.