Forty Five is the number on my house, and has two F’s for the A to Z Challenge! 45 belongs to the set of numbers that fascinated me when I was in elementary school. It’s a multiple of 9, 9×5, and its digits, 4+5, add up to 9, as do 18, 27, 36, 54, 63, 72, 81 and 90. I felt like I had discovered the secret of the universe when I learned this trick. On another math note, with more F’s, in 2011 I am 43, and my husband is 47, and we are both prime numbers at the same time, ie. a number that is only divisible by itself and the number 1.
Fun with Figures! At first, when I saw your link, I thought you were going to post on 45 records!
Your house numbers look lovely and full of hospitality, but my head is kind of swirling with all that math though 🙂