Question

Express each of the following numbers as the sum of three odd primes.

$31$

Answer 1

We know that, the number whose only factors are $1$ and itself is called a prime number.

Odd prime numbers between $1$ and $31$ are $3,5,7,11,13,17,19,23,29$

We have to use $3$ prime numbers to get a sum of $31$,

$31=5+7+19or31=3+11+17or31=7+11+13$

Hence the sum of $31$ is $5+7+19or3+11+17or7+11+13$