pattern number, javascript, loop

I am trying to print this pattern using javascript.

but I need to enter by the user the following: for example: enter a starting number: 2 insert a final number: 5 enter the jump :2

so far i try this,

let beginGetal = Number(prompt("Geef een begingetal in:"));
let eindGetal = Number(prompt("Geef een eindgetal in:"));
let sprong = Number(prompt("Geef een sprong in:"));
let string = "";
let count = beginGetal;

for (let i = 1; i <=eindGetal; i++) {

    for (let j = 1; j <= i; j++) {
       string += count +"," ;

        count++;
    }
    string += "\n";
}
console.log(string);

>2
>3,4,5,
>6,7,8,9,10,
>11,12,13,14,15,16,17,
>18,19,20,21,22,23,24,25,26

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