Question

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

$\left(a\right)21$

$\left(b\right)31$

$\left(c\right)53$

$\left(d\right)61$

Answer 1

$\left(a\right)21=3+5+13$ where $3,5,13$ are odd as well as prime.

$\left(b\right)31=3+5+23$ where $3,5,23$ are odd as well as prime.

$\left(c\right)53=3+7+43$ where $3,7,43$ are odd as well as prime.

$\left(d\right)61=3+5+53$ where $3,5,53$ are odd as well as prime.