Question

Which prime number is often not listed the elevators of a high-rise building? Why not?

Answer 1

The prime number that is often not listed in the elevators of a high-rise building is the number 1. This is because, by convention, the number 1 is not considered a prime number. Prime numbers are defined as positive integers greater than 1 that have no divisors other than 1 and themselves. Since 1 only has one divisor (which is 1), it does not meet the criteria to be considered a prime number. Therefore, it is typically excluded from the list of prime numbers on elevators.

Answer 2

Write as concisely as possible
The prime number that is often not listed in the elevators of a high-rise building is the number 1. This is because, by convention, the number 1 is not considered a prime number. Prime numbers are defined as positive integers greater than 1 that have no divisors other than 1 and themselves. Since 1 only has one divisor (which is 1), it does not meet the criteria to be considered a prime number. Therefore, it is typically excluded from the list of prime numbers on elevators.

Answer 3

The number 1 is often not listed as a prime number on elevator signs because it is not considered a prime number by convention due to its unique divisor characteristics.