There are infinitely amount of multiples of 17. Here are the first few though:
17 34 51 68 85 102 119 136 153 180 197 214 231 248 265
We can help them get food and bare necessities like shelter, water, and clothes. Also if they lost their job, try to help them find a new one. Be aware, since sometimes, people spend the money you donate on drugs or alcohol, so donating money isn't always the best idea.
Homeless people are exactly what they sound like - they are people who do not have a living space inside a building either because they can't afford it or other reasons.