question_answer 14)

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

Answer:

                (a) We have, 21                \[\Rightarrow \] 21 = 3 + 5 + 13 where 3, 5 and 13 are odd prime numbers. (b) We have, 31                \[\Rightarrow \] 31 = 3 + 5 + 23 where 3, 5 and 23 are odd prime numbers. (c) We have, 53                                 \[\Rightarrow \] 53 = 13 + 17 + 23 where 13, 17 and 23 are odd prime numbers. (d) We have, 61                 \[\Rightarrow \] 61 = 7 + 13 + 41 where 7, 13 and 41 are odd prime numbers.