Question

Express each of the following numbers as the sum of three odd primes:
(a) 21
(b) 31
(c) 53
(d) 61

Answer 1

(A). 21=7+7+7
(B). 31=23+5+31
(C). 53=41+5+7
(D). 61=41+13+7

Answer 2

$\text{(a) 21 = 3 + 7 + 11}$



$\text{(b) 31 = 3 + 17 + 11}$



$\text{(c) 53 = 13 + 17 + 23}$



$\text{(d) 61 = 13 + 19 + 29}$