number finder

I want to be able to take this chart and find where unique 3 or 4 digit numbers are connected to each other on this chart. basically to highlight where those numbers are connected on this chart. I what to be able to plug in up to 5 three or 4 digit numbers to find out where they link on the chart, like if they 3 digits connect they will highlight. what im trying to do is locate a number pattern based on the numbers i input.