If you have a lot of numbers to input (or maybe a variable number of inputs) and need to create form for them, you can also use the ui-template Dashboard node and use the features of the underlying Angular framework. ng-repeat will let you dynamically build any HTML/Angular structure including multiple input boxes.
Alternatively, you could us a single textbox input and collect the numbers as a string then parse that string either using a function node or a change node with the JSONata split function.
"1,2,3,4,....,99"
JSONata in a change node:
$split(payload, ',')
Which should return an array from the original string.