Across
- 1. Element of an integers
- 6. Fear of number 13
- 7. Patron saint of mathematicians
- 9. Numbers which share a relationship with other numbers
- 12. Most popular favourite number
- 13. Start of natural numbers.
- 15. A number that reads the same backward and forward.
- 19. A geometrical close bounded figure which has 20 sides.
- 20. The division slash.
Down
- 2. The symbol for division (i.e. ÷)
- 3. The smallest prime number
- 4. An actual unit of time for 1/100th of a second.
- 5. Smallest perfect number
- 8. Palindromic prime with an even number of digits.
- 10. A baseball field is of the perfect shape.
- 11. Set of numbers has an “e” in it.
- 14. Number that is spelt with letters arranged in alphabetical order.
- 16. Considered as the origin of the calculator.
- 17. Consider as a magic number
- 18. An irrational number