I like doodling and had an idea based on a flash game, where numbers are hidden in a picture, and it's ended up better than i expected. So have fun with it. And if you can give feedback on it that highly appreciated.
Every whole number from 1 to 50 is appearing once in the picture below. Better quality picture here.
Disclaimer: since it's hand drawn, besides my best efforts, there are some fake positive answers (where its kinda looks like a number, when its not supposed to be). But i think if you find the right answer, you know it is the right one.
There can be some answers which are not Arabic numbers.