Upper KS2 Challenge
What is the number?
- Its less than 100.
- Its one more than a multiple of 3
- Exactly one of its digits is prime
- If you reverse its digits you get a prime
- Its not a multiple of 5
- Its not prime
- It has exactly 4 factors
- Its not square
- The sum of its digits is prime
- If you multiply it by 5 the answer is greater than 5