Here are thirteen interesting facts about the number thirteen. 1. The number thirteen is a Happy Number. To decide if a number is a happy number you begin by separating it's digits. Square each digit and find their sum. Then separate the digits of the sum, square them and find their sum. Repeat this process until you get the number 1. If you do, your original number is a happy number. 2. The number thirteen is a Prime Number . 3. The digits in the number thirteen are the first two positive odd numbers. 4. The number thirteen is a Centered Square Number. A centered square number is the sum of two consecutive square numbers. Each term is also two times the number squared, minus two times the number plus one. Below are the first six centered square numbers. Can you figure out what would be the next in the list? Here is a challenge you could try if you are interested. 5. There will be TWO Friday the ...
