any of the following numbers works ...12, 23, 34, 45, 56, 67, 78, 89,
No because as for example 23 is a prime number but 32 is a composite number
38
Alberto
The sum of the squares of the digits of 13 is 12 + 32 = 10. The sum of the squares of the digits of this result is 12 + 02 = 1. Because this process results in a 1, this number is a happy number.
No, not always. When you reverse a two-digit prime number, the result may or may not be a prime number. It depends on the specific number you are reversing.
No, reversing the order of the digits of a two-digit prime number does not always result in a prime number.
No because as for example 23 is a prime number but 32 is a composite number
No. For example, reversing 23 gets 32.
19
As a result of the rule that you use the definition of the term - such as significant digits - when finding them for a number.
38
Alberto
13
the result is always even
The sum of the squares of the digits of 13 is 12 + 32 = 10. The sum of the squares of the digits of this result is 12 + 02 = 1. Because this process results in a 1, this number is a happy number.
The answer is 39. 3+9=12, 3x9=27. 12+27=39.
No, not always. When you reverse a two-digit prime number, the result may or may not be a prime number. It depends on the specific number you are reversing.