MATLAB: Finding n (the number of dots in base of triangle) using while loop with known triangle nummber (T=120)

Question

How am I supposed to write the skript using a while loop to find the number of n when i know that the sum of the triangle is 120?

n = 0;
T = ?
t = 0 % 
while t ?
    
    n = ?
    t = ?
    
end 

Answer 1

t = 1;
n = 1;
while t<120
  n=n+1;
  t = t+n;
end
disp(n)