Denise starts it off with a puzzle:
A Smith number is a [composite, that is, not prime] integer the sum of whose digits is equal to the sum of the digits in its prime factorization.
Got that? Well, 58 will help us to get a better grasp on that definition. Observe:
58 = 2 × 29
5 + 8 = 13
2 + 2 + 9 = 13
And that’s all there is to it! I suppose we might say that 58′s last name is Smith. [Nah! Better not.]
- What is the only Smith number that’s less than 10?
- There are four more two-digit Smith numbers. Can you find them?
Then she adds sweet little riddles and jokes. The posts she links to look great. I'm looking forward to spending more time with them.